Brisbane, Australia
Brisbane: Naomi Osaka wins in return; Holger Rune, Grigor Dimitrov rally but Ben Shelton falls
No. 2 seed Dimitrov came from a set down to topple Andy Murray in a match between two former champions at the event.
This is Korpatsch's first WTA 500 first-round victory since WTA Ningbo last year where she defeated qualifier Jodie Burrage in straight sets.
Osaka (JPN) defeated Korpatsch (GER), 6-3, 7-6 (9), in the first round of the Brisbane International Monday.