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Kei Nishikori

Sibling rivalry: Alexander Zverev beats brother Mischa at Citi Open; Tiafoe ousted

Sibling rivalry: Alexander Zverev beats brother Mischa at Citi Open; Tiafoe ousted

For brothers Alexander and Mischa Zverev, this was, in many ways, just like many another day on the professional tennis tour: They warmed up together at a tournament.

The difference on Thursday at the Citi Open, where Alexander is the defending champion and seeded No. 1. For the first time after one of those practice sessions, the two Zverevs faced each other in an ATP main-draw match.

Seems safe to say Alexander has never hugged an opponent quite the way he did No. 15 seed Mischa after beating his older sibling 6-3, 7-5 to reach the quarterfinals at the hard-court tuneup for the U.S. Open. And Mischa has never beamed after a loss quite the way he did on this occasion — or...

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