Jack Sock defeated Lukas Lacko 7-6 6-2 in the Atlanta quarter-final on hard. The result followed the form book — Jack Sock came in leading the head-to-head 2–0, defending last year's round of 32. Jack Sock extended the head-to-head to 3–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2016-07-18 | Washington | R32 | hard | Jack Sock | 7-6(1) 6-4 |
| 2015-07-13 | Newport | R16 | grass | Jack Sock | 3-6 7-6(4) 6-4 |
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.