Second seed Rafael Nadal eased past unseeded American Frances Tiafoe to reach the Australian Open semi-finals and continue his bid to win all four Grand Slams for a second time.
The 32-year-old Spaniard cracked 29 winners in a 6-3 6-4 6-2 victory.
Nadal broke 21-year-old Tiafoe in each of his first service games of the set.
The 17-time Grand Slam champion will play Stefanos Tsitsipas in the last four after the 20-year-old Greek beat Spain's Roberto Bautista Agut.
"It is emotional to be back in the semi-finals," said Nadal, who retired injured in his quarter-final against Marin Cilic last year.
"I had some troubles in this event so, after a while of not playing, to be back in the semi-final means a lot to me. I feel very lucky to be where I am after all the troubles I've been through."