World No. 1 Jannik Sinner of Italy needed three sets to overcome Tallon Griekspoor of the Netherlands 6-7 (8), 6-3, 6-2 in the first round of the Terra Wortmann Open on Tuesday in Halle, Germany.
Sinner hit 15 aces to Griekspoor's 11 and saved all four break points he faced while going 3-for-4 on opportunities to break his opponent's serve.
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