Jan Choinski defeated Botic Van De Zandschulp 6-1 6-3 in the Germany F2 qualifying round on carpet. The upset overturned the form book — Botic Van De Zandschulp came in ranked #41.
Choinski J. took it in straight sets.
Jan Choinski beat Botic Van De Zandschulp 6-1 6-3. Umpiry, "Jan Choinski vs Botic Van De Zandschulp — Germany F2 Qualifying Round", https://umpiry.com/match/2018-01-22/choinski-vs-zandschulp-germany-f2-qf?utm_source=cite (as of 22 January 2018).