Dominic Thiem defeated Daniil Medvedev 6-2 3-6 7-6 in the St. Petersburg quarter-final on carpet. The upset overturned the form book — Daniil Medvedev came in defending last year's round of 32.
Thiem D. came through in three sets.
Thiem D. and Medvedev D. faced 9 of the same opponents in the last 12 months. Thiem D. went 9–5 (64%) against them, Medvedev D. 5–9 (36%). Thiem D. came out better against 5 of 9 comparable opponents, Medvedev D. against 1.
Dominic Thiem beat Daniil Medvedev 6-2 3-6 7-6. Umpiry, "Dominic Thiem vs Daniil Medvedev — St. Petersburg Quarter-final", https://umpiry.com/match/2018-09-17/medvedev-vs-thiem-st-petersburg-qf?utm_source=cite (as of 17 September 2018).