Alexander Zverev made some harsh comments about the balls used at the Rio Open just before suffering a shock loss. On Friday, the top seed saw his campaign end in the quarterfinal after world No. 86 Francisco Comesana completed an upset 4-6 6-3 6-4 win.

Expert ATP 250 quarterfinal preview with head-to-head insights and top betting tips for Zverev vs Cerundolo in Buenos Aires.

Australian Open finalist Alexander Zverev wasted a big third-set lead as he suffered a second straight quarter-final defeat in South America, 4-6, 6-3, 6-4 against Argentine Francisco Comesana in Rio de Janeiro.

The quarterfinals at the ATP Rio Open are set, and some unexpected names have emerged. This has not been a good week for the seeded players, but the top seed, Alexander Zverev and defending champion,

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