Nadal, who has won 22 Grand Slams, lost in the second round to Mackenzie McDonald, an American who has never cracked the top 40 in the world rankings.
MELBOURNE, Australia — The end came all at once for Rafael Nadal, and then it happened slowly.
Down one set and on the ropes against Mackenzie McDonald in the second round of the Australian Open on Wednesday, Nadal injured his hip while chasing down a shot in the eighth game of the second set.