John Isner

Insights

Peak came late, with a 2018 semifinal and two quarterfinals

His best Grand Slam run was the 2018 Wimbledon semifinal at age 33. He also reached the quarterfinals twice, and both came in the same late-career window: the 2018 US Open and 2011 US Open.

Most of the career was built on consistency, not deep runs

Across 59 tournaments and 147 matches, his overall record was 88-59, a 60% win rate. The results table shows eight round-of-16 finishes, but only five appearances beyond that stage.

2018 was his clear high-water mark

In 2018 he produced his strongest Grand Slam season: semifinal at Wimbledon, quarterfinal at the US Open, and round of 16 at the French Open. That is the only year in the data with three results at R16 or better.

Clay improved markedly in the middle of his career

His French Open results progressed from R128 in 2011 to R32 in 2013, then R16 in 2014, 2016, 2017, and 2018. That sequence shows a sustained clay-court step forward rather than a single isolated spike.

The final stretch ended with a sharp drop-off

From 2021 through 2023, he never advanced past the third round: R32 at the 2021 French Open, R32 at Wimbledon and the French Open in 2022, and only R64 or R128 finishes in 2023. The closing phase contrasts strongly with the 2018 peak.