tie-break
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7-6 (7) and 7-6 (6): our intern asks what the numbers in brackets are doing
Alexander Zverev beat Karen Khachanov 6-3, 7-6 (7), 7-6 (6) to reach the US Open final. Two of the three sets were settled in a tie-break.

Alexander Zverev beat Karen Khachanov 6-3, 7-6 (7), 7-6 (6) to reach the US Open final. Two of the three sets were settled in a tie-break.