US OpenHardQuarter-finals18 Aug 2025 · 19:25
K. Volynets
#88 · USA
VS
S. Costoulas
#135 · Belgium

Odds

Market
Volynets
Costoulas
Winner

Player analysis

K. Volynets has been inconsistent recently, going 3–2 over the last five matches. Point margins have been modest — DS averaging +6.6. Wins have been functional rather than dominant. The serve has been a concern — averaging only 5.7/10, leaving K. Volynets vulnerable on second serve and facing frequent return pressure.

DS 6.58Trend mixed

S. Costoulas comes into this match in difficult form — 2 wins from the last 5. Point margins have been modest — DS averaging +5.7. Wins have been functional rather than dominant. The serve has been a concern — averaging only 5.8/10, leaving S. Costoulas vulnerable on second serve and facing frequent return pressure. Break point efficiency is a red flag — S. Costoulas has been losing the important points, with a BP efficiency of -11 over recent matches.

DS 5.72Trend down

Recent form

Hard court stats

Volynets
Stat
Costoulas
52.7%
Win rate
63.5%
106–95
W–L
125–72

Avg stats — last 5

1st serve %70%
1st serve won60%
2nd serve won40%
BP converted60%
BP saved50%
Aces1
Double faults2
1st serve %60%
1st serve won70%
2nd serve won40%
BP converted40%
BP saved50%
Aces1
Double faults3