Dominic Thiem defeated Denis Istomin 6-2 7-5 in the St. Petersburg quarter-final on carpet. The result followed the form book — Dominic Thiem came in leading the head-to-head 1–0. Dominic Thiem extended the head-to-head to 2–0.
Thiem D. took it in straight sets.
Thiem D. and Istomin D. faced 2 of the same opponents in the last 12 months. Thiem D. went 1–1 (50%) against them, Istomin D. 0–2 (0%).
Only 2 common opponents — too few for any conclusion. Shown without assessment.
Carpet: Thiem D. leads 1–0 · Hard: Thiem D. leads 1–0