Jan Lennard Struff defeated Hubert Hurkacz 7-6 6-4 6-1 in the GER vs POL round robin on clay. The upset overturned the form book — Hubert Hurkacz came in ranked #34.
Struff J. took it in straight sets.
Jan Lennard Struff beat Hubert Hurkacz 7-6 6-4 6-1. Umpiry, "Jan Lennard Struff vs Hubert Hurkacz — GER vs POL Round Robin", https://umpiry.com/match/2016-09-16/hurkacz-vs-struff-ger-vs-pol-rr?utm_source=cite (as of 16 September 2016).