What Is an Unforced Error in Tennis : Forced vs unforced Error Tennis

If you have watched any tennis broadcast, you have seen the “unforced errors” count flash on screen next to winners and aces. It is one of the most talked about stats in the sport, and also one of the most argued about. Here is exactly what it means, how it differs from a forced error, and why even top coaches say it is the hardest stat in tennis to score fairly.

What counts as an unforced error

An unforced error is a mistake made on a shot where the player had time, balance, and full control of the situation but still missed. A classic example is netting a routine forehand in the middle of a neutral rally, or double faulting on a second serve with no return pressure involved. The key test scorers use is time and position. If a player had both and still missed, it is unforced.

Unforced error vs forced error

A forced error happens when the opponent’s shot is difficult enough that the player is stretched, rushed, or out of position, and the miss follows from that pressure rather than from the player’s own execution. Missing a stretch volley off a hard passing shot is a forced error. Missing an easy sitter in the middle of the court with no pressure at all is unforced. The line between the two is judged shot by shot, and it is not always obvious even to trained scorers.

Why the stat is controversial

Coaches and analysts have long pointed out that unforced errors are subjective. Tennis strategist Craig O’Shannessy has argued publicly that the category is misleading, since every shot in a professional match carries some form of pressure from the score, the opponent’s reputation, or the moment in the match. Veteran statistician Bill Mitchell, who charts matches for the US Open, has said scorers can genuinely disagree on the same point depending on how they read time and position.

The term itself was coined roughly 40 years ago by statistician Leo Levin, who defined it as a situation where a player is completely in control and still makes the mistake. Even Levin acknowledged the judgment involved, since factors like how hard a ball was struck and how much time a player actually had are not always clear cut.

How commentators and stats services score it

At events like the US Open, a dedicated statistician charts every point live and makes the forced or unforced call as it happens. The same point can be scored differently by different charters, which is part of why players sometimes push back on their own unforced error counts after a match.

Notable examples from professional matches

• Novak Djokovic was charted with 100 unforced errors against Gilles Simon at the 2016 Australian Open, in a match he still won in five sets.
• Simona Halep committed only three unforced errors against Serena Williams in the 2019 Wimbledon final.
• Eugenie Bouchard was charted with just four unforced errors against Petra Kvitova in the 2014 Wimbledon final.

How to reduce unforced errors in your own game

• Play within your limits and avoid low percentage shots when a safer, higher margin ball will do the job.
• Improve footwork so you arrive early and balanced, rather than compromising your swing at the last second.
• Balance aggression with placement instead of going for maximum power on every shot.
• Practice a consistent serve toss and rhythm, since double faults are one of the most common unforced errors at every level.