Yoshihito Nishioka defeated Jack Sock 3-6 6-2 6-1 in the Acapulco round of 32 on hard. The upset overturned the form book — Jack Sock came in leading the head-to-head 4–0. Yoshihito Nishioka claimed a first win over Jack Sock in five meetings, narrowing the head-to-head to 4–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-08-30 | US Open | R128 | hard | Jack Sock | 6-7(5) 6-2 6-4 6-2 |
| 2021-08-02 | Washington | R64 | hard | Jack Sock | 6-7(3) 4-0 RET |
| 2021-07-12 | Newport | R16 | grass | Jack Sock | 6-2 6-3 |
| 2017-03-20 | Miami Masters | R64 | hard | Jack Sock | 2-4 RET |
Each player's serve crossed against the other's return, converted to expected hold of serve. Recent completed matches, ATP, WTA & Challenger. About
Averages over each player's completed matches in the selected window (197 vs 199). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About