MELBOURNE, Australia (AP) — The way Rafael Nadal managed to somehow retrieve a forehand midway through the second set shocked even Roger Federer, who has been on the receiving end of the Spaniard’s unbelievable shots more than anyone else in Grand Slams.

It was a tipping point in their Australian Open semi-final. Federer had lost the first-set tiebreaker but was still throwing his whole arsenal at Nadal.

At 15-30 in the sixth game of the second set, Federer thought he’d wrong-footed Nadal with a volley deep into the left corner. Nadal lunged for a desperate forehand, swinging just as the ball was about to bounce for the second time and angling it back over the net. Federer, in good position but not expecting he’d need to play another shot, framed a volley. It gave Nadal a breakpoint, and he quickly broke Federer for the first time in the match.

He completed his 23rd win in 33 head-to-heads, and ninth in 11 Grand Slam matches, 7-6 (4), 6-3, 6-3 in 2 hours and 24 minutes against the 17-time major winner.

A win over another Swiss, number eight-seeded Stan Wawrinka, in Sunday’s final, would give Nadal a 14th Grand Slam title and make him the first man to win all four majors at least twice in the Open era.

Nadal missed the 2013 Australian Open during a seven-month lay-off for illness and a knee injury, but returned to win the French and US Opens among his 10 titles for the season and finished the year at number one. He won the Australian Open in 2009, beating Federer in the final, and lost in a five-set, 5-hour, 53-minute 2012 final to Novak Djokovic after ousting Federer in the semis. In other years, he’s struggled with injuries — it’s the only Grand Slam tournament he hasn’t won at least twice.

Injuries kept him out of the 2006 Australian Open and hampered his progress in the 2010 and 2011 quarter-finals.

Nadal is now second on the list of players reaching Grand Slam finals, joining Ivan Lendl on 19 — Federer leads the list with 24. Another Grand Slam title would lift Nadal to equal second on the all-time list with Pete Sampras, who was in the crowd for the match.