Ryan Nijboer defeated Jan Lennard Struff 6-4 6-4 in the Rotterdam qualifying round of 16 on hard. The upset overturned the form book — Jan Lennard Struff came in ranked #59, defending last year's round of 32.
Nijboer R. took it in straight sets.
Ryan Nijboer beat Jan Lennard Struff 6-4 6-4. Umpiry, "Ryan Nijboer vs Jan Lennard Struff — Rotterdam Qualifying Round of 16", https://umpiry.com/match/2019-02-09/nijboer-vs-struff-rotterdam-q16?utm_source=cite (as of 9 February 2019).