Rudolf Molleker defeated Jannik Sinner 6-4 7-5 in the Greece F4 round of 32 on hard. The upset overturned the form book — Jannik Sinner came in ranked #1.
Molleker R. took it in straight sets.
Rudolf Molleker beat Jannik Sinner 6-4 7-5. Umpiry, "Rudolf Molleker vs Jannik Sinner — Greece F4 Round of 32", https://umpiry.com/match/2018-03-19/molleker-vs-sinner-greece-f4-r32?utm_source=cite (as of 19 March 2018).