Nadal unsure of return date

Rafael Nadal has admitted that he was not sure when he would 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. The defeat ended a run …