Victoria Azarenka overcame some anxiety, a sore left knee, and a slew of frustrating forehand errors before fending off American teenager Sloane Stephens to reach the Australian Open final against Li Na.
For the second time in two days, 19-year-old Stephens sat patiently in a courtside chair late in the second set while an experienced, older player took a medical timeout.
On Thursday, the top-seeded Azarenka asked for a medical timeout after wasting five match points with a sequence of forehand errors, but returned to quickly finish off a 6-1, 6-4 win on her sixth match point. The outcome was different on Wednesday, when Stephens rallied from a set and a break down to beat an injured Serena Williams in three sets.
After dropping serve in the ninth game of the second set, Azarenka went to the locker room for treatment - the tournament confirmed later it was for left knee and rib injuries - and then returned to break the 29th-seeded Stephens' serve to finish off the match.
"Well I almost did the choke of the year right now at 5-3 having so many chances I couldn't close it out," Azarenka said in an on-court TV interview. "I just felt a little bit overwhelmed. I realized I'm one step away from the final and nerves got into me for sure."
The crowd had tried to get Stephens back into the match in the second set. Fans yelled encouragement after almost every point and a few in the crowd heckled Azarenka by mocking the noise she makes when she hits the ball.
Azarenka started to lose her composure when she hit a forehand way beyond the baseline on her third match point, her hooting sound elevating to a louder, high-pitched shriek.
After Stephens saved the match points, the crowd gave her a huge round of applause and a few people jumped out of their seats. Azarenka got a tepid applause after clinching the match.
The 23-year-old Azarenka later said she'd had difficulty breathing.
"I couldn't breathe. I had chest pains," she said. "It was like I was getting a heart attack.
"After that it wasn't my best, but it's important to overcome this little bit of a struggle and win the match."
Stephens said the timing of the medical break didn't affect the match.
"It's happened before. Last match, match before, I've had people going for medical breaks, going to the bathroom," she said. "Didn't affect me. Just another something else that happens."
The temperature hit 97 degrees during the second women's semifinal, slightly hotter than it had been when Li Na beat No. 2-ranked Maria Sharapova 6-2, 6-2 to reach the Australian Open final for the second time in three years.
Sharapova was the heavy favorite after conceding only nine games in her first five matches, a record at the Australian Open.
But the semifinal started badly for the 25-year-old Russian, serving double-faults to lose the first two points and conceding a break in the first game.
Li was the first Chinese player to reach a Grand Slam final when she lost to Kim Clijsters at Melbourne Park in 2011. She had her breakthrough a few months later when she won the French Open, beating Sharapova in the semifinals along the way.
The crowd got behind Li early in the match, yelling "Come on, Li Na!" and others yelling "Jia You!" which is "Come on" in Chinese. After she broke Sharapova to take a 5-2 lead, the Chinese fans in the crowd shook Chinese flags and shouted again, "Jia You!"
"I don't know what happened (but) I always play well here, so thanks guys," said Li, who was playing her third Australian Open semifinal in four years. "I just came to the court feeling like, `OK, just do it."'
The heat and the speed of the court surface suited Li's game.
She broke Sharapova in the third game of the second set and served an ace to move within a point of a 4-2 lead, but lost the next three points to give her opponent a break opportunity.
Two big second serves took Sharapova by surprise, and Li fended off the challenge.
Li's coach, Carlos Rodriguez - who worked with retired seven-time major winner Justine Henin - pumped his fist over his heart after Li won the game.
Sharapova had control in her next service game, but Li scrambled from side to side and pushed the reigning French Open champion to go for the lines, getting a series of unforced errors and another break.
The sixth-seeded Li has been working since August with Rodriguez, and credits him with reviving her career with a renewed emphasis on condition.
"I'm happy. I know I have a tough coach, a tough physio," Li said, looking across to the stands and adding: "You don't need to push me anymore. I will push myself."
Sharapova, who lost the 2012 Australian final in straight sets to Azarenka, admitted it was hard to get into the match against Li.
"She was certainly much more aggressive than I was, dictating the play. I was always on the defense," said Sharapova, who could have gained the No. 1 ranking by reaching the Australian final. "When I had my opportunities and break points in games that went to deuce, I don't think any of them really went my way."
The composition of the women's semifinals was somewhat unexpected.
Stephens produced the upset of the tournament to advance to a Grand Slam semifinal for the first time with her 3-6, 7-5, 6-4 victory over 15-time major winner Serena Williams on Wednesday. Williams, who had been bidding for a third consecutive Grand Slam title, hurt her back in the second set and, after leading by a set and a break, ended a 20-match winning streak.