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Marin Cilic

Marin Cilic, of Croatia, serves to Dominic Thiem, of Austria, during the third round of the US Open tennis championships in New York.

Photo by AP/PTI

Rafael Nadal hit 37 winners, breaking Marin Cilic six times in another impressive display.

AP

Croatia's Marin Cilic returns to Alexander Zverev during the ATP Men's Singles Final, at The O2 Arena in London. Cilic made 46 unforced errors as he gave up a break advantage in both sets in losing to Alexander Zverev.

AP/PTI

Marin Cilic, of Croatia, returns a shot to Kei Nishikori, of Japan, during the quarterfinals of the U.S. Open tennis tournament, in New York.

AP Photo/Jason DeCrow

Marin Cilic, of Bosnia, serves to Hubert Hurkacz, of Poland, during the second round of the U.S. Open tennis tournament in New York. Cilic won in straight sets.

AP Photo/Adam Hunger

Croatia's Marin Cilic celebrates after beating Sam Querrey of the United States at the end of their Men's Singles semifinal match on day eleven at the Wimbledon Tennis Championships, in London.

AP Photo/Kirsty Wigglesworth