Second seed Daniil Medvedev overcame both the heat and Italian Fabio Fognini on Wednesday at the Tokyo Olympics as he moved into the quarter-finals.

The 25-year-old required two medical timeouts and a visit from a trainer due to the intense humidity before he rallied to defeat Fognini 6-2, 3-6, 6-2 in two hours and 26 minutes.

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The ROC star, who is making his Olympics debut this week, saved seven of the eight break points he faced in the match, winning 70 per cent (30/43) of his first-service points. Medvedev struck the ball with great depth as he raised his level in the crucial moments in the final set, converting both break points he had to advance.

The World No. 2 will next face Spaniard Pablo Carreno Busta after the sixth seed moved past Germany’s Dominik Koepfer 7-6(7), 6-3. Carreno Busta saved a set point at 5/6 in the first set tie-break as he claimed victory in one hour and 56 minutes.

Greek star Stefanos Tsitsipas could not follow in Medvedev’s footsteps and reach the quarter-finals as he was upset by Frenchman Ugo Humbert. The 14th seed battled back to record a career-best win, defeating the third seed 2-6, 7-6(4), 6-2.

The 23-year-old who lifted the NOVENTI OPEN title in June, fired 22 winners, taking his fourth match point to advance. Humbert will next play the ROC’s Karen Khachanov after the 25-year-old downed Argentine Diego Schwartzman 6-1, 2-6, 6-1 in two hours and one minute to join countryman Medvedev in the last eight.