World No. 1 Jannik Sinner reached the Halle Open semifinals by battling to a 6-2 6-7(1) 7-6(3) win over German Jan-Lennard Struff on Friday.
World No. 1 Jannik Sinner reached the Halle Open semifinals by battling to a 6-2 6-7(1) 7-6(3) win over German Jan-Lennard Struff on Friday.
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