Sunday, 26 April 2015

Could smart scheduling benefit ITF players?

For tennis players, intelligent scheduling often seems to be lacking. We often see players participating in tournaments and wonder why they chose to play in that particular event, rather than in a different event in that week. This is an issue from the very top level in ATP down through Challengers and into the ITF events. In this article, I will focus on looking to find a way that players could look at optimising their schedule at the ITF level.

The reality is that it is almost impossible to survive financially purely relying on the ITF Tour. The prize money situation there has been written about in many places and, while this may change in the future, at the moment, unless you are winning titles almost every single week, the main aim for players at the ITF level has to be to boost their ranking to the point where they are able to play Challenger events.
Could tournaments in places like Bukhara be the smart move for young players looking to boost their ranking?

For losing in the first round of a mid-level Challenger event ($75k) would result in a cheque for $780. To receive the same amount of money, a player would have to reach the final of an ITF event. Winning a $10k futures event results in a cheque for $1,300 - this is the equivalent of winning one match in a Challenger event. Thus, the main aim for a player at ITF level must simply be to boost their ranking to the point where they are able to enter Challengers.

At the same time, players will improve more rapidly by playing against higher quality opposition. There is only so far you can improve without testing yourself against higher quality opponents, so again, reaching Challenger level should be beneficial for a player's development.

All this sounds obvious. To state that players should be looking to improve and rises up the rankings is not exactly a great insight. However, with around 10 ITF events in any given week, the decision of which events to play can be critical.

In the men's ITF Tour, there are two levels of Futures tournaments - $10k and $15k. The majority of events are $10k, although there are often a couple of $15k events each week. The table below shows the prize money and points for each stage of elimination in the two types of event.
To take an example, let us look at the ITF events for last week. There was a total of 12 events last week, three of which were $15k events and nine of which were $10k events.

Given that outside of the tournament classification, the strength of the field does not have any impact on the prize money or ranking points on offer, it makes sense that a player should look to try and play in the weakest possible event to maximise his chances of collecting ranking points.

A side effect of the rating system that my tennis model generates is the ability to classify the quality of the field in any given tournament. As a result, we can compare the level of each of the twelve events from last week. The table below shows the rating of the highest-rated player in the field, the mean rating and the median rating.
The three $15k events were those in Santiago, Little Rock and Bukhara. The highest rated player in any of the twelve events was Rui Machado in Doha with an ITF rating of 1353.3. The tournament with the weakest highest-rated player was the El Kantaoui event, where David Perez Sanz's 1135.6 meant that it lacked any serious top level ITF players.

Obviously, purely looking at the best player in the event is not overly helpful - an event may have one standout player and plenty of average players. If we look at the mean rating for each event, we can see that while the $15k event in Santiago only has the fifth strongest highest-rated player, it has the strongest field of the weak. There may not be any standout top-level player, but there are plenty of strong players in the draw, meaning that it would be a relatively difficult event to expect to progress in.

Given that Santiago is a $15k event rather than a $10k event, this probably does not come as a huge surprise. However, we can see that the other two $15k events do not necessarily have such strong fields. Little Rock only had the 6th highest mean rating of the twelve tournaments, while Bukhara was only 8th. The Chinese event in Anning is the second highest mean value for the weak at 983.4 followed by the Spanish event in Reus.

One possible concern could be that a couple of weak qualifiers or local wildcards could drag the average of an event down, giving a false impression of a weak event. However, if we lookbvi at the median rating, the top three events remain the same, although Reus goes ahead of Anning, but still behind Santiago. However, now Little Rock and Bukhara, the other two $15k events, have dropped to 8th and 9th respectively.

Despite there being more ranking points on offer at these two events, they seem to have some of the weaker fields of the week's ITF events. Could there be any argument that players could pick up some cheap ranking points by travelling to one of these two events?

If a player wants to play a $10k event, why would he chose to play the event in Reus, where a strong field would mean a succession of tough matches to pick up the same number of ranking points as in Jakarta or Heraklion? The much weaker fields here would arguably mean that the expected ranking points that a player could expect to collect from playing the tournament would be higher.

Obviously, the decision on which tournament to play will depend as well on the current ranking of the player in question. As one might expect, the cut-off for main draw entry to the $15k event tends to be slightly higher in general. The Bukhara event had the lowest cut-off at 686, while you would need to be ranked higher than 647 to make it into Santiago.

If your ranking is high enough to make it into one of these events, there is a strong argument to head for either Bukhara or Little Rock. If not, a ranking of above 1,114 would get you into a weak event in Jakarta, while you would only need to be above 1,294 to make it into Doha.
A beautiful location for tennis combined with a weak field should be irresistible for players

The money issue is of course a factor - for a Spanish player, it is obviously cheaper to play in Spain. Transport costs would be far lower and you feel more at home in your own country. However, making certain sacrifices in the short-term could bring longer-term benefits if you can boost your ranking to the point where you can play Challenger events. Whether you borrow money, find a sponsor or even come to an agreement with someone with money who could finance you for a share of future prize money, speculating in the present could lead to accumulating more money in the future.

Obviously, this is a fairly simplistic approach for now. You would not travel long distances on a weekly basis to different events. However, you could perform similar analysis on groups of events. For example, in a three week spell, you could decide to play two $15k events in Uzbekistan, followed by the $15k event in Kazakhstan. The two Uzbek events are less than two hour drive from each other, while the trip to Kazakhstan is slightly longer at just under nine hours. They may not be the easiest places to play in, but your expected points from these three relatively weak $15k events would definitely be higher than playing what tend to be stronger European events and the journey to Challenger level could be sped up.

Monday, 13 April 2015

League 2 Statistical Review

With most teams having only four matches left of the season, there are still a number of issues to be decided in League 2. The top two teams in the division, Burton Albion and Shrewsbury, are separated by just one point as they battle for the title, while there are five teams separated by just four points in the battle for the final two playoff places. At the bottom, it would appear to be two teams from Hartlepool, Tranmere and Cheltenham that will be relegated from the football league.

League 2 has been one of the divisions that I have been focusing on in the 2014/15 season, so I thought I might put something together with some of the stats that I have accumulated from the season thus far. The first is a chart that plots a team's shots on target ratio (SoTR) against their PDO (read here for an explanation of PDO), which gives a rough idea of which teams are good and which teams have benefitted or suffered due to an element of luck.
The closer to the top of the chart that a team is, the better the team is (based on their SoTR). Similarly, the further toward the right that a team finds itself, the more lucky they have been.

We can see that Shrewsbury are well clear at the top in terms of quality in the division. This is reflected by the fact that they are challenging for the title and have been close to the top from the very first week. Their closest challengers in the table are Burton, who we can see are also a very good side, but have possibly benefitted from an element of good fortune this season - their scoring percentage of 34.6% is the fourth highest in the division, while their save percentage of 73.4% is eighth.

A couple of teams that stand out in this chart. Firstly, Dagenham and Redbridge are a huge outlier in the bottom right-hand corner. Based on SoTR, they are actually the worst team in the division, yet they sit comfortably in 15th position in the table. This can be explained by their huge PDO score - a scoring percentage of 37.0% is the highest of any side in the division, while their save percentage of 75.5% is the fifth highest. It could be that they have massively clinical strikers (the experienced Jamie Cureton is their highest scorer this season) and a very good keeper, but the reality is that they have benefitted hugely from luck this season and will have to significantly improve next season if they are not to face a relegation fight.

On the other end of the scale, Mansfield have certainly not benefitted from any luck. Their SoTR of 47.7 is not great by any means, but their scoring percentage of just 21.1% is the second lowest in the division and is likely the source of their struggles in recent months.

Another curious team are Oxford United. A SoTR of 54.5 puts them as the sixth best team in the division, yet they sit in 16th position and are technically still not mathematically safe (although in reality they will be fine). Their low PDO can help to explain this with a scoring percentage of just 26.2% and a save percentage of 63.6%, which is the lowest in the division. Indeed, at home at the Kassam Stadium, it is only after the most recent match that their save percentage rose above the 50% mark to 51.0%, which is an astonishingly low value. As a comparison, the second lowest home save percentage is 62.5%.

The final team to look at is Luton, which we shall do in slightly more detail. A couple of months ago, they were looking in excellent shape to secure a playoff spot and possibly even challenge for automatic promotion. Indeed, it was only just over two months ago that the bookmakers priced them at 1.50 for promotion out of the division.

However, after a run of ten defeats in twelve games, they have dropped to ninth in League 2 and are now priced at 4.50 simply to make it into the playoff places. It has led to the usual media narrative that they are throwing it away, that confidence is low and that they have choked. Is this true? The chart below shows their SoTR and PDO as the season has progressed.
We can see that their SoTR has been dropping over the past ten matches or so from a peak of 50.0 to its current level of 46.2. However, a maximum SoTR of just 50.0 is far from good enough to seriously be challenging for the playoffs, let alone for either automatic promotion or the title.

What we can see though is that they have been benefitting from a very healthy PDO throughout the season, which has been steadily dropping in recent months. At the half-way point of the season, their PDO was at a very high value of 113.3 and since then, it has steadily fallen to its current level of 107.4. Chances are that it is this fall in PDO that has been behind their poor run recently. Whilst their level has dropped slightly, this PDO correction is the biggest reason for their dip in form.

So, we mentioned at the start that there were a number of aspects of League 2 still to be decided. Let us take a quick look at the difficulty of the matches that the relevant teams have remaining. First, we shall look at the title race.
We can see that while Shrewsbury have the easiest match in terms of their trip to Cheltenham, on the whole Burton have the easier run-in with an average SoTR for their four opponents of 48.8 compared to Shrewsbury's 51.0. With a one point deficit already, tomorrow's fixtures could be pivotal in terms of Shrewsbury's title hope as they face a tough trip to Bury, while Burton play a relatively poor Carlisle team.
There are two playoff places up for grabs between five teams, separated by four points. Stevenage are currently in pole position on 65 points, followed by Plymouth on 64, Newport on 62, then Luton and Exeter on 61.

We can see that Stevenage will be pretty confident of securing one of those playoff spots with a fairly straight-forward end to the season. Portsmouth have improved recently, but Stevenage will fancy their chances, although if they slip up slightly, the trip to Luton on the last day of the season could be a big match for both clubs. Plymouth have the toughest run-in, although that is predominantly due to the trip to Shrewsbury on the final day. Home matches against AFC Wimbledon and Tranmere give them a good chance to secure the points that they require before that difficult trip to New Meadow.

If either of those two slip up, Luton or Newport could be set to pounce. Despite Luton's painful PDO reversion over the past few months, they have matches against two of the division's worst side in the next two games before a potentially decisive match against Stevenage on the final day. Exeter are the big outsiders with two very tough matches against Wycombe and Southend to come in their next two games. They have two easier matches to finish the season, but their hopes could be gone by the time they reach that stage.
Despite being in the bottom two for the majority of the season, a recent revival has lifted Hartlepool out of the relegation zone and onto 40 points. Tranmere currently sit 23rd on 39 points, while Cheltenham are bottom on 37 points.

We can see that Hartlepool not only sit outside the relegation places, but have the easiest run-in. They will particularly be targetting the home match against Accrington and the trip to Carlisle on the final day to secure the points that they require to stay up.

Cheltenham have a tough trip to Northampton and welcome title-chasing Shrewsbury, which means that there is huge pressure on their match tomorrow night at home to Cambridge. Fail to win there and they face a very tough task to avoid the drop. Tranmere have a pair of trips to Mansfield and Oxford and they will be hoping that there is no late PDO reversion for those side. Regardless, they have a tough schedule and will do well to avoid the drop.
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