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.

Carlos Alcaraz won the Cincinnati Open title in a little more than 20 minutes after top-ranked Jannik Sinner was forced to retire because of illness during the first set