Andy Murray beat Stefanos Tsitsipas to claim his first victory over a top-five player since 2016 and advance to the Boss Open semi-finals in Stuttgart.
The Briton beat the Greek top seed and world number five 7-6 (7-4) 6-3.
Murray moved fluently on the grass court to claim one of his biggest victories by ranking since returning from career-saving hip surgery in 2019.
His last victory over a top-five player came against then-world number two Novak Djokovic at the 2016 ATP Finals.