Serena Williams advances to the Australian Open semifinals to set up a showdown with Naomi Osaka

In men’s action, 114th-ranked qualifier Aslan Karatsev of Russia became the first man in the professional era to get to the semifinals in his first Grand Slam appearance, defeating No. 18 seed Grigor Dimitrov 2-6, 6-4, 6-1, 6-2. Karatsev next faces the winner of Tuesday night’s quarterfinal between eight-time Australian Open champion Novak Djokovic and No. 5 Alexander Zverev.