Carlos Alcaraz was almost unrecognizable when he stepped on the court against Reilly Opelka for his first-round match the US Open. His usual bushy, mop haircut was replaced by an unexpected buzz cut as a result of a pre-game mishap involving his brother.

Prior to playing, Alcaraz ran into golf star Rory McIlroy, who reached out his hand to rub the scalp's stubble. When Alcaraz played in the U.S. Open's mixed doubles event last week, he did so with a full head of hair.