ShotLink: How PGA Tour Data Changed Golf
Before 2003, nobody knew where tour players actually hit the ball. ShotLink turned every shot on the PGA Tour into a coordinate, and within a decade it had overturned most of the received wisdom about what separates good golfers from great ones.
For most of golf’s history, the sport measured itself with four numbers: fairways hit, greens in regulation, putts per round, and score. The PGA Tour started keeping those officially in 1980. They tell you almost nothing. A player who hits every fairway with a 3-wood and a player who bombs it into the first cut have identical fairway percentages of zero and one hundred, and neither number says which one is playing better golf.
ShotLink ended that. When the PGA Tour rolled the system out across its events in 2003, golf went from counting outcomes to recording positions, and the data history that followed rewrote most of what the sport thought it knew.
What ShotLink actually does
The system is less futuristic than the name suggests. At a ShotLink event, roughly 250 to 350 volunteers work the golf course. Laser units are positioned around each hole, operated by walking volunteers who sight the ball wherever it comes to rest. A second crew records the lie: fairway, primary rough, intermediate cut, bunker, green, recovery.
Every shot becomes a record. Starting coordinate, ending coordinate, lie, distance, player, hole, round. Accuracy runs to about an inch on the putting surface and within a yard through the green. A full tournament week produces around 32,000 shots. A season produces well over a million.
That is the whole innovation. The system does no analysis and builds no models; it produces a precise record of where the ball sat before and after each swing. Everything interesting that followed came from other people asking questions of that file.
The question ShotLink made answerable
Once you know where the ball started and where it finished, you can ask a question that traditional stats cannot touch: how much did that shot help?
Answering it requires a baseline. Take every tour shot from 150 yards in the fairway and count how many strokes it took, on average, to hole out from there. The answer is about 2.8. Do the same from 20 feet on the green: roughly 1.87. Do it for every distance and every lie, and you have a table of expected strokes.
Now the arithmetic works. A player hits an approach from 150 in the fairway to 20 feet. He started in a 2.8-stroke position, spent one stroke, and ended in a 1.87-stroke position. The shot gained 2.8 minus 1 minus 1.87, or negative 0.07 strokes. Slightly below tour average, despite being a perfectly respectable-looking shot to 20 feet.
That calculation is strokes gained, and it exists because ShotLink made the baseline table possible. Mark Broadie, a Columbia Business School professor who had been studying golf decision-making with his own amateur database, was the one who built it out and pushed it into the mainstream. The PGA Tour adopted strokes gained putting as an official statistic in 2011 and expanded it to off the tee, approach and around the green in 2016.
What the data history revealed
Broadie published his findings in Every Shot Counts in 2014, and the conclusions were uncomfortable for a sport that had been coaching on instinct.
Putting matters far less than anyone believed
“Drive for show, putt for dough” turns out to be backwards. When Broadie decomposed scoring differences among tour players, putting accounted for roughly 15% of the gap between the best and the rest. Approach play accounted for about 40%. Off the tee, around 28%. The short game, the part every club pro tells you to work on, was the smallest lever of the four.
The reason is variance. Putting results swing wildly week to week and regress hard, which is why the leading putter at one event is often mid-pack the next. Long-game skill is stable. It shows up every week, so it does more work over a season.
Distance beats accuracy
ShotLink data showed that hitting it further is worth more than hitting it straighter across essentially every level of play. A drive that finishes 20 yards longer in the rough usually leaves a better position than a shorter one in the fairway, because the expected-strokes penalty for rough at a given distance is small compared with the gain from being closer.
This finding took a decade to filter into how the game is coached, and it eventually reshaped how tour players train.
Proximity is the approach statistic that counts
Greens in regulation treats a 12-foot birdie look and a 55-foot two-putt as identical successes. Expected strokes does not. The distance you leave yourself is what predicts the next score, which is why proximity replaced GIR as the serious measure of iron play.
Pros and amateurs lose strokes in different places
Broadie’s amateur database, collected separately through his GolfMetrics project, let him compare directly. A 90-shooter does not lose to a tour pro mainly on the greens. The gap is overwhelmingly in the long game, and it widens with distance from the hole. We covered this split in more detail in how pros and amateurs lose strokes differently.
Why ShotLink still shapes the amateur game
The PGA Tour makes ShotLink data available to academic researchers through its ShotLink Intelligence program, and that decision matters more than it sounds. Sports analytics tends to live behind closed doors. Golf’s core dataset went to universities, which is why the expected-strokes baselines that sit inside consumer golf apps trace back to peer-reviewed work rather than proprietary guesswork.
Every app that shows you a strokes gained number is standing on that foundation. The baseline your approach shot is measured against is a descendant of the tour’s laser volunteers walking fairways in 2003.
The Tour has been moving toward camera-based ball tracking to replace parts of the manual laser operation, which will make collection cheaper and denser. The underlying idea does not change: record positions, not outcomes.
Getting the same treatment for your own game
The gap between a tour player and a club golfer is not that one has better instincts. It is that one has had every shot recorded and analysed since 2003, and the other is working from a scorecard with 18 numbers on it.
Closing that gap does not require lasers. golfity applies the same expected-strokes framework to rounds you log yourself, using start and end positions for each shot rather than sensors or GPS hardware. You get strokes gained broken into off the tee, approach, around the green and putting, measured against a benchmark you choose.
That is enough to answer the question ShotLink was built for. Not “did I hit 8 greens,” but “where did those 4 strokes actually go.” If you want the short version of Broadie’s conclusions before you start, our key takeaways from Every Shot Counts covers the findings that survived twenty years of tour data.
