Sofia Open: Stefanos Tsitsipas downs Germany’s Jan-Lennard Struff in straight sets to reach quarter-finals
Stefanos Tsitsipas, who stunned Roger Federer on his way to a shock appearance in the Australian Open semi-finals, made a winning return to action on Thursday when he defeated Germany's Jan-Lennard Struff 7-6 (7/5), 6-4 to reach the Sofia Open quarter-finals
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