Masters: Trying to predict the winner? Don’t bet on it.
By Bill Felber
The Masters is just around the corner, with gamblers, fantasy players and casual fans looking to predict the winner. However, week-to-week performance variations make actually calling a major event’s outcome close to a fool’s errand.
For the next few weeks, fantasy sports sites and real-world gaming centers alike will do a brisk business catering to people who believe they can predict the winner of the Masters.
It’s a trending activity given the profusion of theories regarding what constitutes the winning “formula” at Augusta National. Beyond that, both in legal gambling centers and also in country club polls across the nation where the stakes extend beyond “entertainment purposes only,” the lure of imagined riches draws folks to wager on the winner.
This year in particular, a recent U.S. Supreme Court ruling making it easier to bet on sports generally will only fuel interest.
For dedicated golf gamblers, there’s only one problem: actually projecting the winner of the Masters – or any golf tournament on a week-to-week basis – comes pretty close to being a fool’s errand. Despite what your cousin with the inside info tells you, there is no reliable method of predicting, from week to week, which player will out-perform all the others.
The numbers are as clear on this as it is possible to be. Begin with the raw problem of the concentration of talent on the PGA Tour. To date in 2019, 211 players have competed in one or more PGA Tour events. From best to worst, the spread of their stroke averages totals only a fraction more than four per round. That means an average of more than 50 players are differentiated by just one stroke.
Most Masters bettors, of course, aren’t interested in 200 players; their eyes and brains are trained on the movements of the top 15 or 20. So let’s confine ourselves to the top 15 in the current FedEx Cup standings.
In predictive statistics –political polling being the example most people would be familiar with – experts generally seek what is called a 95 percent confidence level. In other words, they want to know the margin across which one can say with a 95 percent degree of confidence that a result will occur.
Applied to golf, we can calculate this using a two standard deviation rule, since two standard deviations covers 95 percent of any mathematical set of data.
The question then becomes, for any of our top 15 players, what is the two standard deviation spread of their performance? In the table below, I’ve laid out that two standard deviation spread based on each player’s actual Strokes Gained Scores in the four major component categories – driving, approach shots, chips and putting – for the 2019 season to date.
The table shows the actual standard deviation spread for each player as well as his seasonal average score and his resulting two standard deviation range that we can, with a 95 percent confidence level, expect the player to shoot in any given round:
Player 2 SD Spread Average Normal Range
- Dustin Johnson 6.142 69.580 63.438 – 75.722
- Rory McIlroy 2.430 69.594 67.164 – 72.224
- Xander Schauffele 5.438 69.890 64.452 – 75.328
- Matt Kuchar 5.442 69.879 64.437 – 75.321
- Paul Casey 7.666 70.219 62.553 – 76.885
- Charles Howell III 4.802 70.144 65.342 – 74.946
- Gary Woodland 6.016 69.857 63.041 – 75.873
- Justin Thomas 6.268 69.432 63.164 – 75.700
- Marc Leishman 5.432 70.271 64.839 – 75.703
- Rickie Fowler 6.092 69.827 63.835 – 75.919
- Brooks Koepka 6.394 70.472 64.078 – 76.866
- Phil Mickelson 6.080 70.345 64.265 – 76.425
- Justin Rose 5.876 69.858 63.982 – 75.734
- Bryson DeChambeau 5.386 70.093 64.707 – 75.479
- Keith Mitchell 6.882 70.768 63.886 – 77.650
Using Dustin Johnson as an example, let me simplify this for you prospective gamblers. Based on his performance to date, all we can say with 95 percent confidence is that when he gets to Augusta National, Dustin Johnson will shoot rounds between 63 and 76. That translates to an expected four-round score somewhere between 252 (36-under par) and 304 (16–over par). Is that helpful, gamblers?
I didn’t think so.
Essentially the same is true of all of the game’s other top players. Among them, the most predictable player – based on his 2019 results – is Rory McIlroy, with a two standard deviation spread of 2.43 strokes against a 69.594 average. But even that means the most we can say about McIlroy with 95 percent confidence is that he will shoot between 67 and 72, which over four Masters rounds puts him somewhere between 20-under and even.
Aside from McIlroy, the only other leading player with a two standard deviation range under five strokes is Charles Howell III. The 95 percent predictability of his performance is 65 to 75, which over four rounds brings him home somewhere between -28 and plus 12.
The average two standard deviation spread of our 15 most appealing players is 5.762 strokes. Across their 70.015 scoring average, that’s a predicted range of between 64.253 and 75.777. Across four Masters rounds, all we’re truly comfortable saying is that they’ll shoot somewhere between 257 and 303. Duh!
These of course are tour averages, and they are not Augusta National-specific. Yes, the course matters, and yes, we can adjust for it.
Of our top 15 players, 11 have completed at least 10 tournament rounds at Augusta, enough to provide a performance sample. Here is the same table for those 11 using only their Masters performances. In this case, the players are listed in order of predictability:
Player 2 SD Spread Average Normal Range
- Brooks Koepka 3.652 72.333 68.681 – 75.985
- Matt Kuchar 5.292 72.143 66.851 – 77.435
- Dustin Johnson 5.620 71.846 66.226 – 77.466
- Phil Mickelson 5.878 72.667 66.789 – 78.545
- Justin Thomas 6.170 72.670 66.510 – 78.830
- Justin Rose 6.176 71.731 65.555 – 77.907
- Charles Howell III 6.536 73.962 67.426 – 80.498
- Gary Woodland 7.140 73.857 67.717 – 80.997
- Marc Leishman 7.406 72.778 65.372 – 80.184
- Rory McIlroy 7.452 71.618 64.166 – 79.070
- Paul Casey 7.466 72.333 64.867 – 79.799
Even for Koepka, the most predictable “top-tier” player at the Masters, the normal two-standard deviation range of his performance at Augusta exceeds 3.5 strokes, meaning all we can project is that he’s likely to post a four-round score between 12-under and 16-over. For sexier picks like McIlroy, the projected ranges are even broader.
Here’s the bottom line. The stultifyingly close level of competitive balance on tour, in combination with the wide week-to-week normal performance variations among the game’s best players, makes predicting the outcome of any major – or any tournament, for that matter – far more a matter of luck than skill. And you can take that to the bank.