Koepka had to undergo wrist surgery after the 2017 season and had hoped that his recuperation would be complete in time for the 2018 Masters Tournament but he had to withdraw, saying that he was only 80% fit. He recovered to successfully defend his U.S. Open title at Shinnecock Hills, becoming the first player since Curtis Strange in 1989 to win consecutive U.S. Open titles, which has occurred only seven times. He won his third major at the 2018 PGA Championship at Bellerive Country Club to become only the fifth player, and the first since Tiger Woods in 2000, to win the U.S. Open and the PGA titles in the same year.