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.

Argentina's world number 86, Francisco Comesana delivered a stunning performance at the Rio Open on Friday. He defeated the Australian Open finalist and world number two Alexander Zverev 4-6, 6-3, 6-4 in the quarter-finals. This win is a major milestone in Comesana's career as it is his first-ever victory over a top-five opponent.

Friday's win in Rio de Janeiro is the 24-year-old Francisco Comesana's first victory over a top-five ranked opponent.

Francisco Comesana (No. 86 ranking) will take on Alexandre Muller (No. 60) in the semifinals at the Rio Open presented by Claro on Saturday, February 22.In his most recent match on Friday,

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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,