HALLE: Nick Kyrgios defeated world number six Stefanos Tsitsipas in the round of 16 of the Halle Open.
The 65th-ranked Australian battled back to defeat Greek Tsitsipas 5-7 6-2 6-4.
After losing the first set in Germany, Kyrgios shattered his racket.
In the second set, he got into an altercation with the chair umpire and was given a warning for time-wasting, which Kyrgios explained was due to his needing to wipe sweat from his hands.
"He said I was playing too slow. Statistically, I'm one of the fastest," Kyrgios said.
"I had to walk to the sidelines to get my towel. There is this thing called sweat in 30C heat that runs down onto your hands.
"I needed to wipe my hands, and he gave me a warning."
Kyrgios will face Spanish sixth seed, Pablo Carreno Busta, in his second consecutive quarter-final as he prepares for Wimbledon, after reaching the semi-finals in Stuttgart last week.
After shattering his racket and exchanging insults with the fans during his loss to Andy Murray, the Australian was given a penalty.