'I don't know when I'll be back,' says Rafael Nadal

Rafael Nadal admitted Monday that he wasn't sure when he will return to action after Frances Tiafoe condemned him to his earliest US Open exit since 2016. Four-time US champion Nadal, bidding for a 23rd Grand Slam title, lost 6-4, 4-6, 6-4, 6-3 in the last-16 to 26th-ranked Tiafoe.