Stefanos Tsitsipas and Reilly Opelka walk to Court 17 ahead of their quarter-final clash at the Western & Southern Open.

Reilly Opelka hits 29 winners past Matteo Berrettini on Tuesday for a place in the Western & Southern Open quarter-finals.

Reilly Opelka saves both break points he faces to beat Cameron Norrie in straight sets at the Western & Southern Open.

Reilly Opelka and Taylor Fritz are two of the top three Americans in the FedEx ATP Rankings. They will compete in the Western & Southern Open.

Reilly Opelka plays six sets on Sunday — winning three-setters in the semi-finals and the final — to triumph in Delray Beach.

Reilly Opelka battles past former World No. 3 Milos Raonic in Delray Beach to reach his second ATP Tour final.

Reilly Opelka hammered 20 aces en route to defeating Yoshihito Nishioka at the New York Open.

John Isner, Ugo Humbert, Ivo Karlovic and Reilly Opelka play lacrosse with members of the New York Riptide lacrosse team.

Reilly Opelka looks to build on his 2019 season this fortnight at the Australian Open.

Reilly Opelka reached 1,000 aces this season on Saturday at the Swiss Indoors Basel.

Reilly Opelka strikes at least 10 aces in each set — and 31 total — to defeat Roberto Bautista Agut in Basel.

Reilly Opelka hits 16 aces and loses just six of his first-service points to beat Yasutaka Uchiyama on Friday in Tokyo.

Reilly Opelka earns his first US Open match win over Fabio Fognini.

Reilly Opelka reaches his second BB&T Atlanta Open quarter-final on Wednesday.

American Reilly Opelka will face John Isner for the fourth time in the second round in Atlanta.

Reilly Opelka celebrates beating Stan Wawrinka, the No. 22 seed, on Wednesday at Wimbledon.

Reilly Opelka reaches the second round of the Millennium Estoril Open on Monday.

Taylor Fritz and Reilly Opelka, two of five Americans seeded in Houston, visit local children in Highland Park.

Reilly Opelka celebrates a second-round win in Miami.

Reilly Opelka rifles 43 aces against Brayden Schnur to win his first ATP Tour title at the New York Open.

Reilly Opelka hammers 156 aces in his five matches at the New York Open for his first ATP Tour title.

Reilly Opelka wins an epic New York Open final over Brayden Schnur for his first ATP Tour title.

Reilly Opelka hits 43 aces on Saturday evening en route to victory against John Isner in the New York Open semi-finals.

Reilly Opelka serves up an impressive comeback against John Isner to reach his first ATP Tour final at the New York Open.

Reilly Opelka will go for his second ATP Tour semi-final this week in New York.