Strokes Gained and the Data Gap in Vietnamese Golf

On the final round of an event on the VGA Tour, the leader after 54 holes stepped onto the 16th tee with a two-shot advantage. He did not miss a single drive. He did not miss a fairway. But two approach shots to the green came up 12 metres short, a chip caught the edge of the green and rolled back, and three putts inside 2.5 metres all stayed out. The scorecard read bogey-bogey-par. The lead changed hands.

In the gallery, people talked about weak nerves. On the forums, people talked about a cold putter. Neither explanation has data behind it. That is the problem with Vietnamese golf right now: we have plenty of stories, but very few measures good enough to test them.

Golf is a sport where the traditional scorecard — fairways hit, greens in regulation, putts per round — has survived for nearly a century. They are easy to count, easy to understand, easy to print on a leaderboard. But they carry a structural flaw: they count events, not value.

A fairway hit on a 460-metre par-4 is not the same as a fairway hit on a 340-metre hole. A green in regulation from 4 metres is not the same as one from 12 metres. And a putt from 1.2 metres is not the same as a putt from 6 metres, even though both are recorded as a single putt. The traditional scorecard lumps situations of completely different value into the same box, then lets the reader draw their own conclusions.

In 2026, Professor Mark Broadie of Columbia University introduced the Strokes Gained method, and the PGA Tour began adopting it widely a few years later. The principle is simple: instead of counting strokes, Strokes Gained measures how many strokes a shot gains or loses against the field average from the same position. A putt from 6 metres that drops is not one putt; it is roughly plus 0.5 strokes against expectation. A putt from 1.2 metres that misses is not a missed putt; it is roughly minus 0.9 strokes.

In Vietnam, golf is growing fast in courses and players, but its data infrastructure is nearly frozen. Regional international amateur events, including the Asia-Pacific Amateur Championship, have seen Vietnamese golfers climb in the rankings, showing that regional competitiveness is real. But potential does not automatically become analysis. This is the starting point for everything that follows.

Strokes Gained splits into four categories: off-the-tee, approach, around-the-green, and putting. When Broadie decomposed PGA Tour data, he found something that runs against the intuition of the crowd.

In the scoring structure of elite golf, approach shots account for roughly 40% of the difference between golfers, driving about 28%, around-the-green about 17%, and putting only about 15% — yet putting is the category with the highest week-to-week variance.

This means a hot putter is real, but it does not last. A golfer who wins on plus 3 strokes gained putting in one round will usually give most of it back the following round, because putting skill is noisier with luck to a far greater degree than approach skill. Conversely, the ability to hit approach shots close to the pin is the most stable skill, and therefore the best predictor of long-term performance.

I carried this principle into golf after years of working with football data. Based on my experience watching matches, I once used xG to show that possession does not decide results, and I see golf has a similar structure. Fairways hit are like possession percentage: easy to see but not tightly correlated with scoring. Strokes Gained: Approach is like xG: it measures the quality of chances, not the quantity of actions.

The problem with Vietnamese golf is that it lacks the data infrastructure to compute Strokes Gained. The VGA Tour system currently relies mainly on manual scorecards and a handful of volunteer recorders. There is no camera system tracking every shot, no database of ball positions in metres. That does not mean analysis is impossible, but it does mean every conclusion about who plays well in Vietnam today lacks a quantitative foundation.

Numbers do not lie. But reputation whispers into the ear of the person who does not read the board.

Take the home-course advantage story. In 2026, when football stadiums closed during the pandemic, I found that home advantage in the V.League fell from 49% to 38% with no crowd. The same question applies to golf: does home advantage come from the course or from the crowd? Global golf data shows home advantage in golf is far weaker than in football, and it comes mostly from familiarity with the terrain — green slopes, wind direction, pin positions — not from applause. In Vietnam, where golf crowds are still thin, I would argue most of what is called home advantage is really course-information advantage, and it can be neutralised by giving visiting golfers enough practice rounds before the event.

Another blind spot: Vietnamese golf is excited about driving distance. Young golfers are encouraged to raise clubhead speed and chase extra yards. But per Broadie's decomposition, driving accounts for only about 28% of scoring differences, and the benefit of hitting it far is partly cancelled by the risk of finding rough or hazards. A 300-yard drive into thick rough can be worse than a 270-yard drive down the middle. In PGA Tour data, the correlation between raw driving distance and performance is far weaker than the correlation between Strokes Gained: Approach and performance.

This is where I have to talk about the thing I hate: uncertainty. I like numbers that can be verified. But golf teaches me that an unforeseen variable — a wind that shifts on the 17th, a green watered unusually — can be stronger than any model.

Another observation from schedule data: young Vietnamese golfers often play too many events in a single season, with dense competition and travel. In another sport, I once warned about overusing young players before their bodies mature. Golf has its own specifics, but the strain on the wrist, back, and mind of a 16-year-old golfer playing ten events a year is a question that sports-medicine data should be asked about.

How do you read a Vietnamese golf event without Strokes Gained? There are three substitute measures I still use when raw data is scarce.

First, the average putt distance remaining after the first approach. If a golfer habitually leaves the ball inside 6 metres after his approach, his low putt count is the result of approach skill, not of the putter. This is how you separate cause from effect, something the traditional scorecard cannot do.

Second, the scrambling rate — the ability to save par after missing a green. This measures around-the-green skill, and it is more stable than putting. A golfer with a high scrambling rate across many rounds is a golfer with a genuine technical foundation.

Third, the scoring distribution by hole. If a golfer scores well on easy holes and collapses on hard ones, that signals poor course management, not poor technique. On the VGA Tour, where many courses have large difficulty gaps between holes, this measure is especially useful.

I do not predict. I read the data and accept the consequences.

But I also have to admit my own limits. Applying PGA Tour data standards to Vietnamese golf is a trap. Courses in Vietnam have different characteristics: high humidity, greens that are usually slower, and monsoons that swing strongly by season. A Strokes Gained model built on US Tour data can forecast wrongly when applied to a course in Dong Nai or Da Nang. Local data must be collected locally, in local context, before it is allowed to speak.

And there is a human factor data cannot capture. Vietnamese golfers mostly have no dedicated fitness coaching team, no sports psychologist, no caddie formally trained in reading greens. When I analyse a missed putt on the 18th, I am analysing a shot struck by a person who may have woken at 4am, driven three hours to the course, and competed with no one helping read the green. Numbers do not lie, but numbers also do not tell the whole story.

This is the counterintuitive angle: in golf, the most visible thing is the least predictive. The hot putter is what fans remember. The five-metre approach to the pin is what fans forget. But if I had to pick one metric to predict who wins the next event, I would pick Strokes Gained: Approach — or, when it is unavailable, average putt distance remaining — not putt count.

There is a paradox in how Vietnamese golf media reports. A golfer who wins on good putting is praised for nerve. A golfer who loses on bad putting is called mentally weak. Both judgements ignore the fact that putting is the highest-variance category, meaning the same golfer, with the same skill, can win this week and lose next week with nothing changing in ability. We are praising and blaming based on noise, not signal.

The real signal lies in approach shots and the ability to save par. The noise lies in putting. Mistaking noise for signal is the most common error when reading a golf event.

What is the signal for the next round? If the VGA Tour wants to raise the quality of analysis, the first step is not buying expensive technology, but collecting ball-position data with discipline: recording the distance remaining after each approach, the pin position each day, and wind conditions. Those three data fields, collected consistently over one season, are enough to build a rough but useful Strokes Gained model for the Vietnamese context.

I wrote about Germany's collapse before the tournament. Not because I was clever, only because I did not believe in the myth. Vietnamese golf has its own myths: myths about the putter, about distance, about home advantage. They are not entirely wrong. They have simply never been tested.

In golf, one thing I have learned after many years: the right question matters more than the right answer. And the right question for Vietnamese golf right now is not who hits it best, but what we are measuring, and whether that measures the thing that decides victory.