Golf Tutorials

What Happens in Golf When One Ball Hits Another?

By Spencer Lanoue
July 24, 2025

It’s one of the most common, and often confusing, head-scratchers in golf: your perfect shot is rolling along nicely, and then… *clack*… it cannons directly into your friend’s ball. What on earth is the ruling? This guide breaks down exactly what happens when one golf ball hits another, cutting through the confusion with clear, simple explanations for every situation you might encounter on the course.

Understanding the Core Rule: No Penalty (Usually!)

In almost every case where your ball in motion accidentally hits another ball at rest, it's just a bit of bad luck. The core principle you need to remember comes from Rule 11.1a. Here's the gist of it in plain English:

  • There is no penalty to any player. It doesn’t matter if your ball hit your opponent’s ball, your partner’s ball, or even another player’s ball from a different group.
  • The stroke counts, and you must play your ball from wherever it comes to rest.
  • The owner of the other ball (the one that was stationary) must find the original spot where their ball was and replace it. If they can't determine the exact spot, they must estimate it to the best of their ability.

Think of it as Rub of the Green. Sometimes contact helps you, sometimes it hurts you, but accidents happen. The rules are designed not to punish players for these random occurrences. However, as with many things in golf, there is one very important exception to this rule, which we'll cover in detail when we talk about the putting green.

Scenario 1: In the General Area (Fairway, Rough, or Teeing Area)

This is where you'll see a ball hit another ball most often, especially on par 3s or when players hit similar distances off the tee. The ruling here is simple and follows the core principle of Rule 11.1a perfectly.

What to Do, Step-by-Step

Let's paint a picture. You and your friend, Dave, both hit your tee shots on a par 4. His ball is resting comfortably in the middle of the fairway. You're hitting your approach shot from the rough, and you hit a low liner that skids across the fairway and smacks right into Dave's ball, sending his ball flying into the bunker and your ball careening off to the right.

Here’s the procedure:

  1. Dave's Ball: Dave simply finds the original location of his ball in the fairway (the spot where it was resting before you hit it), and he places his ball back on that spot. The fact that it was knocked into a bunker doesn't matter, he gets to replace it without penalty. If he can’t remember the exact spot, he and the other players in the group should make a good-faith estimate.
  2. Your Ball: Your work is even easier. You just walk over to where your ball came to rest after the collision and play your next shot from there.

That's it. No penalties. No drama. It was a complete accident. You both just play on. This same ruling applies whether you’re in the fairway, the rough, a bunker, or a penalty area. If your moving ball hits a ball at rest, the stationary ball gets replaced and the moving ball is played as it lies.

Scenario 2: The Major Exception - On the Putting Green

The putting green is where everything changes. This is the place where precision is rewarded, and a lack of awareness can lead to a penalty. The procedure depends on two things: the form of play (stroke play vs. match play) and where your ball started.

If Your Stroke is Made From the Putting Green

This is the big one. This is the exception you absolutely must remember. Let's say both your ball and another player's ball are on the putting green. You line up your putt...

And you hit their ball.

In Stroke Play

According to Exception 2 to Rule 11.1b, if you make a stroke from the putting green and your moving ball hits another ball that was also at rest on the putting green, you get a two-stroke penalty.

  • You (the putter): You incur a two-stroke penalty. You play your ball from where it came to rest after hitting the other ball.
  • The Other Player: They must replace their ball on its original spot. They do not get a penalty.

Example: You have a 30-foot putt for birdie. Sarah's ball is near your line, but she hasn't marked it yet. You misjudge the speed and your ball collides with hers. That birdie putt just瞬间 cost you two strokes. You'll now be playing your fourth shot (your initial stroke, plus two penalty strokes) from wherever your ball stopped.

Why the penalty? The rules consider it the player's responsibility to ensure the path to the hole is clear. On the putting surface, players have the right to mark and lift their ball, so there's really no excuse for hitting one another's ball. This rule encourages good etiquette and prevents players from gaining an advantage (or disadvantage) from an easily avoidable situation.

In Match Play

Here's some good news! The same situation in a match play format results in a different outcome. If you make a stroke from the putting green and hit your opponent's ball which was also on the green:

  • There is no penalty to anyone.
  • You play your ball from where it lies.
  • Your opponent replaces their ball on its original spot.

The logic is that in match play, you are only affecting one other person (your opponent), who has the right to leave their ball there or mark it. It's considered part of the strategy and gamesmanship of a one-on-one match.

If Your Stroke is Made From Off the Green and Hits a Ball On the Green

This situation trips up a lot of golfers, but it follows the general 'no penalty' rule. Imagine you're just off the green in the fringe or in a greenside bunker.

If you chip, pitch, or even putt from *off the putting surface* and your ball rolls onto the green and hits another player's ball...

  • There is no penalty for anyone, in either stroke play or match play.
  • You play your ball from where it rests.
  • The owner of the ball that was hit replaces their ball on its original spot.

Think of it as a logical extension of the "General Area" rule. Since your stroke wasn't made *from the putting green*, the stricter putting green exception doesn't apply. So go ahead and hole that chip shot, even if it has to carom off your buddy's ball to do it!

A Player Deliberately Leaves a Ball to Help

Sometimes you might ask a player not to mark their ball because it could serve as a useful "backstop" for your shot. Is this allowed?

Yes, it is. Under Rule 15.3a, you are allowed to leave your ball in place to help another player. However, it's a two-way street. The player whose turn it is to play can ask you to mark your ball, and if it's your turn, your opponent or another player can always choose to mark and lift their ball, even if you want it to stay. It's their right.

If two players agree to leave a ball in place to give one of them an advantage (for example, to stop a difficult chip from rolling past the hole), both players receive a two-stroke penalty in stroke play for deliberately colluding to alter the conditions.

Pro Tips for Good Etiquette and Fair Play

Now that you know the rules, here's how to apply them smoothly and with good sportsmanship on the course:

  • When in Doubt, Mark it Out: The easiest way to avoid any penalties on the green is to be proactive. If you think your ball might be close to another player's line or could interfere in any way, mark it. It’s polite and the smart thing to do.
  • Communicate Clearly: If a collision happens, don't get flustered. Just talk it through calmly. Say, "Okay, looks like I hit your ball. No penalty - you just put yours back, and I'll play mine from here." Communication prevents any arguments or misunderstandings.
  • Be Honest with the Spot: When a ball is moved, every player has a responsibility to help identify the original spot. Don't be "that person" who fudges the spot for a better lie. True golfers value the integrity of the game.

Final Thoughts

Navigating the rules when one ball hits another doesn't have to be complicated. Just remember that outside the putting green, it’s a simple "no penalty" situation where the stationary ball is replaced. On the putting green, be diligent about asking players to mark their balls to avoid that dreaded two-stroke penalty in stroke play.

Understanding nuances like the putting green rule in stroke play can be tough under pressure. This is where modern tools can help remove any doubt. If you find yourself in a bizarre rules situation on the course, you don’t have to wonder. With our Caddie AI教练,you can just ask the question and get a definitive, easy-to-understand answer in seconds. Playing with more certainty means you can handle any situation the course throws at you with confidence, letting you focus on what really matters - playing better golf.

Spencer has been playing golf since he was a kid and has spent a lifetime chasing improvement. With over a decade of experience building successful tech products, he combined his love for golf and startups to create Caddie AI - the world's best AI golf app. Giving everyone an expert level coach in your pocket, available 24/7. His mission is simple: make world-class golf advice accessible to everyone, anytime.

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