American Alex Michelsen claimed the biggest win of his career when he stunned Stefanos Tsitsipas 7-5 6-3 2-6 6-4 in the first round of the Australian Open on Monday as the Greek 11th seed became the first major casualty at Melbourne Park.
Michelsen had beaten Tsitsipas at the Japan Open last year and the 20-year-old American kept his unbeaten record against Tsitsipas, a 2023 finalist at the Melbourne Grand Slam.
