What happens if you hit the wrong ball in golf?
In stroke play, playing a wrong ball costs you a 2-stroke penalty under Rule 6.3c — the strokes you made with that ball don't count, and you must find your correct ball and finish the hole adding those two penalties. In match play, the first player to hit a wrong ball loses the hole immediately under Rule 6.3a.
The situation
You think you've found your ball in the rough, play it, and then realise it was someone else's. Or you play a ball with the right brand but the wrong number.
The rule
Under Rule 6.3c (stroke play), playing a wrong ball — any ball other than your ball in play — results in a 2-stroke penalty. The strokes made with the wrong ball do not count. You must then find your correct ball and play it, adding the 2 penalty strokes. If you can't find your correct ball after playing the wrong one, it's still considered lost — take stroke-and-distance relief on top of the 2-stroke penalty. In match play (Rule 6.3a), the first player to play a wrong ball loses the hole.
Real example
Your ball and your partner's are both Titleist Pro V1s in the same patch of rough. You play one — it's theirs. 2-stroke penalty. You must find your own ball (or take lost ball relief if it's not found) and complete the hole adding those 2 strokes.
What to do on the course
- Always mark your ball with a unique mark before the round — a dot, initials, or line
- Identify the ball before playing it: check brand, number, and your personal mark
- In stroke play, if you're unsure whether a ball is yours, don't play it until you're sure
- If you've made a stroke with the wrong ball, don't play any more strokes with it — stop as soon as you realise and correct the situation
Penalty
2-stroke penalty in stroke play. Loss of hole in match play.
Exceptions that change the answer
- a player makes a stroke at a wrong ball that is moving in water in a penalty area or in temporary water → the stroke does not count, and the player must correct the mistake under the Rules by playing the right ball from its original spot or by taking relief under the Rules
Frequently asked questions
What exactly counts as a wrong ball?
A wrong ball is any ball other than your ball in play — that includes another player's ball, a stray ball, or even your own ball if it's out of play (like a provisional you abandoned). Your ball in play is the one you started the hole with, or a ball properly substituted under the Rules.
What happens if I can't find my original ball after playing the wrong one?
Your original ball is treated as lost. You must take stroke-and-distance relief (go back to where you last played from, drop a ball, add one penalty stroke) on top of the 2-stroke penalty for the wrong ball — so three penalty strokes total.
Does the penalty apply if I only hit the wrong ball once?
Yes. The 2-stroke penalty in stroke play applies the moment you make a stroke at a wrong ball, no matter how many strokes you make with it. All strokes with the wrong ball are disregarded.
What if my playing partner and I have identical balls with no identifying marks?
You're both at risk. If you can't distinguish them, neither ball is considered identified — you must treat both as lost and take stroke-and-distance. Always mark your ball uniquely before the round to avoid this.
Can I just pick up and drop a new ball after realizing I hit the wrong one?
No. You must find your original ball and play it from where it lies (or take relief if allowed). If it's lost, you go back to the previous spot under stroke-and-distance. You cannot simply drop a new ball where the wrong ball was played.