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.

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

Raducanu laughed off rumours of a blossoming romantic relationship with Alcaraz earlier this summer, insisting the two stars are ‘just friends’. If Raducanu and Alcaraz do fea

Emma Raducanu and Carlos Alcaraz might have lost in the revamped US Open mixed doubles - but they win the hearts of the New York crowd.

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.