The Greek tyro, 21, broke his big-serving German opponent three times in the Group Andre Agassi match to seal a 6-3, 6-2 win at London's O2 Arena.
Tsitsipas reaches ATP Finals semis after Nadal thriller
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The Greek tyro, 21, broke his big-serving German opponent three times in the Group Andre Agassi match to seal a 6-3, 6-2 win at London's O2 Arena.
