The much-talked-about pairing of Emma Raducanu and Carlos Alcaraz fell to an early exit in the US Open’s mixed doubles competition on Tuesday, losing their first-round match and failing to win a set.

The US Open, the year’s fourth and final Grand Slam, kicks off Sunday, August 24, on the lightning-fast hard courts of Flushing Meadows in New York. For two weeks, the sport’s biggest stars will ...