Thiem and Tsitsipas started the match on Wednesday but were interrupted as evening came on, with the Austrian leading two sets to one; Thiem won the fourth set when the players resumed play on Thursday, reports Efe.
The world No. 8 said he felt very good about his form after winning a four-set match against Tsitsipas, whom he considered one of the toughest players of the second round.
Thiem is to face in the third round Italy's Matteo Berrettini, who beat Latvia's Ernests Gulbis 6-2, 3-6, 6-4, 6-3.
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