Ernests Gulbis defeated Jack Sock 4-6 6-3 6-4 in the Stockholm quarter-final on hard. The upset overturned the form book — Jack Sock came in defending last year's quarter-final, but Ernests Gulbis had been the form player, winning 4 of their last 8 on hard. Ernests Gulbis extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2018-10-22 | Basel | R32 | hard | Ernests Gulbis | 7-5 6-4 |
| 2016-06-27 | Wimbledon | R128 | grass | Jack Sock | 6-4 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 (200 vs 155). ATP, WTA & Challenger.