S
Stefan Kozlov
USA · Active 2013–2026
#290
Ranking
#103
Best Rank
268–242
Win–Loss
52.5%
3–7
Last 10
9–11
Last 20
Record by Surface
Hard
198–17153.7%
Clay
52–4653.1%
Grass
18–2541.9%
Career Averages
1st Serve %61.3%
1st Srv Pts Won66.1
2nd Srv Pts Won48.1
BP Saved %57.0%
BP Converted %42.0%
Return Pts Won41.2
Avg Aces2.7
Avg DFs4.0
Serve Rating243.2
Return Rating159.3
Career Splits
| W-L | Win% | SPW | RPW | DR | 1st% | BPS% | BPC% | |
|---|---|---|---|---|---|---|---|---|
| Surface | ||||||||
| Hard | 198–171 | 53.7% | 59.5% | 41.2% | 1.01 | 61.5% | 57.3% | 41.6% |
| Clay | 52–46 | 53.1% | 57.5% | 43.1% | 1.01 | 60.2% | 55.7% | 44.9% |
| Grass | 18–25 | 41.9% | 59.7% | 36.6% | 0.94 | 61.9% | 58% | 37.5% |
| Tournament Level | ||||||||
| Other | 264–229 | 53.5% | 59.3% | 41.3% | 1.01 | 61.5% | 57% | 42.3% |
| Masters | 4–13 | 23.5% | 54% | 38% | 0.87 | 57.2% | 57.3% | 33.6% |
| Round | ||||||||
| Semi-Finals | 11–7 | 61.1% | 61.4% | 41% | 1.04 | 62.9% | 62.3% | 38.8% |
| Quarter-Finals | 18–28 | 39.1% | 56.9% | 39.8% | 0.95 | 62.1% | 54.1% | 39.1% |
| vs Rank | ||||||||
| vs Top 10 | 0–4 | 0% | 49.1% | 26.7% | 0.67 | 65.7% | 47.7% | 36.4% |
| vs Top 11–50 | 3–10 | 23.1% | 55.9% | 35.5% | 0.87 | 64% | 51.3% | 35.9% |
| Format | ||||||||
| Best of 3 | 268–241 | 52.7% | 59.1% | 41.2% | 1.01 | 61.3% | 57% | 42% |
| Best of 5 | 0–1 | 0% | 69% | 32.3% | 1.02 | 69.7% | 57.1% | 66.7% |