Jack Sock defeated Ivo Karlovic 6-1 6-4 in the Houston round of 32 on clay. The upset overturned the form book — Ivo Karlovic came in leading the head-to-head 4–0, defending last year's round of 16. Jack Sock claimed a first win over Ivo Karlovic in five meetings, narrowing the head-to-head to 4–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2016-07-18 | Washington | QF | hard | Ivo Karlovic | 7-6(4) 7-6(6) |
| 2015-07-13 | Newport | SF | grass | Ivo Karlovic | 7-6(3) 6-4 |
| 2014-02-10 | Memphis | QF | hard | Ivo Karlovic | 7-6(4) 6-7(3) 6-3 |
| 2013-03-07 | Indian Wells Masters | R128 | hard | Ivo Karlovic | 3-6 7-6(8) 6-2 |
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