Although the 27-year-old's debut at the Rio Open didn't go as planned and he criticized the balls, he actually spoke positively about the tournament after the Comesana loss. Last week, the world No. 2 played in Buenos Aires, where he was upset by Francisco Cerundolo in the quarterfinal.

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.

Argentinian Francisco Comesana stunned Australian Open finalist and world number two Alexander Zverev on Friday with a 4-6 6-3 6-4 win in the quarter-finals of the Rio Open, the biggest win of his career so far.

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,