Jack Sock defeated Kevin Anderson 1-6 6-4 6-4 in the Auckland quarter-final on hard. The upset overturned the form book — Kevin Anderson came in leading the head-to-head 3–1, defending last year's semi-final. Jack Sock narrowed the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-07-12 | Newport | QF | grass | Kevin Anderson | 6-7(5) 6-2 6-4 |
| 2017-07-31 | Washington | SF | hard | Kevin Anderson | 6-3 6-4 |
| 2015-08-16 | Cincinnati Masters | R32 | hard | Kevin Anderson | 6-3 7-6(7) |
| 2015-04-06 | Houston | SF | clay | Jack Sock | 7-6(3) 6-3 |
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 (199 vs 200). ATP, WTA & Challenger.
Performance in the biggest moments — break points, deciding sets and tiebreaks (0–100, higher is better). About