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Nick Kyrgios beat world number six Stefanos Tsitsipas at the Halle Open – smashing his racquet and arguing with the umpire during the match. The Australian, ranked 65th, came back to beat Greek Tsitsipas 5-7 6-2 6-4. Kyrgios, 27, smashed his racquet after losing the opening set in Germany. He then got into an argument with the chair umpire in the second set and received a warning for time-wasting – a delay Kyrgios said was due to needing to wipe sweat from his hands. It is a second successive quarter-final for Kyrgios as he prepares for Wimbledon, having gone on…