Alexander Zgirovsky defeated Boris Butulija 6-2 6-4 in the M15 Kazan 3 quarter-final on hard. The upset overturned the form book — Boris Butulija came in leading the head-to-head 1–0. Alexander Zgirovsky claimed a first win over Boris Butulija in two meetings, levelling the head-to-head at 1–1.
Zgirovsky A. took it in straight sets.
Hard: Zgirovsky A. leads 1–0 · Clay: Butulija B. leads 1–0
Alexander Zgirovsky beat Boris Butulija 6-2 6-4. Umpiry, "Alexander Zgirovsky vs Boris Butulija — M15 Kazan 3 Quarter-final", https://umpiry.com/match/2021-11-26/butulija-vs-zgirovsky-m15-kazan-3-qf?utm_source=cite (as of 26 November 2021).