Top singles names and unlikely pairings share the stage in a made-for-primetime mixed-doubles tournament with a million-dollar stakes. Here are the results from Day 1.

World No. 1 Jannik Sinner is officially out of the U.S. Open Mixed Doubles tournament after falling ill in Cincinnati. The Italian retired down 5-0 against Carlos Alcaraz in the Cincinnati Open final on Monday and was due to play Mixed Doubles Tuesday with partner Kateřina Siniaková in New York.

Big names fell early and unexpected teams broke through to steal the spotlight on Day 1 of U.S. Open mixed doubles play, headlining an electric opener packed with upsets and standout performances.

Swiatek and Ruud will meet top seeds Jessica Pegula of the United States and Britain’s Jack Draper in the semi-finals. Read more at straitstimes.com. Read more at straitstimes.com.

The No. 1-ranked Sinner, the defending champion in singles at Flushing Meadows, was supposed to compete in mixed doubles with Katerina Siniakova.

The Spanish second seed snapped the world number one's 26-match winning streak on hardcourts when his ailing rival signalled he could no longer continue while trailing 5-0 in the first set.