Best from the Australian Open semifinals

Rafael Nadal,right, is embraced by Grigor Dimitrov after their semifinal match.

Rafael Nadal in action against Grigor Dimitrov.

Rafael Nadal of Spain reacts during his semifinal match against Grigor Dimitrov of Bulgaria at the Australian Open on Jan. 27.

Grigor Dimitrov of Bulgaria serves in his semifinal match against Rafael Nadal of Spain during the Australian Open on Jan. 27.

Rafael Nadal of Spain looks on in his semifinal match against Grigor Dimitrov of Bulgaria during the 2017 Australian Open at Melbourne Park on Jan. 27.

Bulgaria's Grigor Dimitrov yells while playing Spain's Rafael Nadal during their semifinal at the Australian Open on Jan. 27.

Bulgaria's Grigor Dimitrov reacts after a point against Spain's Rafael Nadal during their men's singles semi-final match during the Australian Open on Jan. 27.

Stan Wawrinka of Switzerland congratulates Roger Federer of Switzerland on winning their semifinal match at the Australian Open on Jan. 26.

Roger Federer of Switzerland celebrates winning match point in his semifinal match against Stan Wawrinka during the 2017 Australian Open on Jan. 26.

Roger Federer plays a forehand smash in his semifinal match against Stan Wawrinka during the 2017 Australian Open on Jan. 26.

Detailed view of Stan Wawrinka's broken racquet between games in his semifinal match against Roger Federer on Jan. 26.

Switzerland's Roger Federer makes a forehand return to compatriot Stan Wawrinka during their semifinal at the Australian Open tennis championships in Melbourne, Australia, on Jan. 26, 2017.

Stan Wawrinka of Switzerland reacts after losing his semifinal match against Roger Federer.

Switzerland's Stan Wawrinka hits a return against compatriot Roger Federer during their men's singles semifinal match in the Australian Open on Jan. 26.

Venus Williams celebrates after defeating Coco Vandeweghe to reach the Australian Open final for the first time in 14 years.

Venus Williams can hardly believe it herself after becoming the oldest Australian Open finalist ever.

Coco Vandeweghe laments a missed point against Venus Williams.

Venus Williams lines up a serve against CoCo Vandeweghe.

Venus Williams plays a forehand return against Coco Vandeweghe.

Coco Vandeweghe slams her racket after missing a shot against Venus Williams.

Coco Vandeweghe plays a forehand smash against Venus Williams.

Venus Williams plays a backhand return to Coco Vandeweghe.

Venus Williams chases down a forehand return against Coco Vandeweghe.

Coco Vandeweghe serves to Venus Williams during the first women's semifinal at the Australian Open.

Venus Williams runs down a forehand return against Coco Vandeweghe

Coco Vandeweghe can't reach a return against Venus Williams.

Serena Williams celebrates after defeating Mirjana Lucic-Baroni in the second semifinal at the Australian Open.

Serena Williams runs down a forehand return against Mirjana Lucic-Baroni.

Mirjana Lucic-Baroni snaps a photo with the crowd before leaving the court.

Serena Williams is all smiles after defeating Mirjana Lucic-Baroni.

Serena Williams serves to Mirjana Lucic-Baroni.

Serena Williams reaches for a backhand return against Mirjana Lucic-Baroni.

Mirjana Lucic-Baroni lines up a serve against Serena Williams.

Serena Williams gets a hug from Mirjana Lucic-Baroni after their semifinal match.

Serena Williams lines up a serve against Mirjana Lucic-Baroni.

Mirjana Lucic-Baroni plays a forehand return against Serena Williams.

Serena Williams celebrates a point against Mirjana Lucic-Baroni.