MELBOURNE, Australia -- Petra Kvitova watched the Australian Open from a distance two years ago, a month after she was injured in a violent home invasion.

Then she lost in the first round last year, and conceded she hadn't returned to a standard that earned her two Grand Slam titles at Wimbledon.

Until now, that is. So she knew the question was coming, perhaps overdue. Still, after her 6-1, 6-4 win over Ashleigh Barty on Tuesday night, the question during an on-court interview reduced her to tears.

She was asked whether she'd ever doubted, ever lost belief that she'd be back in this moment. She had just qualified for her first major semifinal since her run to the 2014 Wimbledon title. There was barely a dry eye in the arena.

As she paused to take in a breath and wipe away tears, the encouragement and cheers from the crowd intensified and reached a crescendo after almost 20 seconds to allow Kvitova to respond to Jim Courier's question.

"Thank you guys. Um, no, really," she said. "I didn't really imagine to [be] playing on this great stadium and play with the best."

Later, the Czech player explained the tears were "a mix of emotions of everything I've been through."

"Sometimes I'm not really recognizing anything from the past," she said. "But when Jim asked that, it wasn't really easy for me to kind of see myself being in a semifinal after everything."

Petra Kvitova was reduced to tears on Tuesday when asked to reflect on her path back to a Grand Slam semifinal. William West/AFP/Getty Images

Since her return to the majors at the French Open in 2017, she has had two first-round exits, two second-round losses and two in the third. The highlight was a run to the 2017 US Open quarterfinals.

Now she's on a 10-match winning streak, having also beaten Barty for the title in Sydney in the week leading up to the Australian Open, and feeling like she's back in the big time.

"For sure. I'm calling it my 'second career.' So it's the first semifinal of the 'second career,'" Kvitova said. "But yeah, it took me a while, for sure. I never really played so well on the Grand Slams, so I'm happy this time it's different. I'm really enjoying it."

And she really is. Her five wins have been in straight sets in an average time of about 1 hour, 6 minutes.

The difference is fewer nerves, more job satisfaction and more freedom.

"I'm seeing life a little bit differently compared with before. I know it's just the sport, it's just the tennis," she said. "Always when you're doing something, you want to do best. Of course, losing, it hurts a lot because you are doing everything for it.

"On the other hand ... I'm always looking back and see what I achieved from the time [before the violent attack]. It's always both sides. But in the end, always the life wins."

She'll play Danielle Collins next, and is one of the few people who entered the tournament who could have predicted the American's run so far.

Collins has a 5-5 career record in Grand Slam matches. It was 0-5 when she got to Melbourne this month. She has taken out three seeded players, including a 6-0, 6-2 win over three-time major champion Angelique Kerber in the fourth round.

In the quarterfinals, she came back to overpower Anastasia Pavlyuchenkova 2-6, 7-5, 6-1 -- conceding only three points as she raced to a 5-0 lead in the third set.

Collins took Kvitova to three long sets at the Brisbane International, her first match of the season. So Kvitova, who like Kerber is left-handed, is wary.

"I won it, but it was over three hours," Kvitova said of her semifinal rival. "She's very fearless and she's playing very, very aggressive."

Collins said she had followed Kvitova's career and admired the 28-year-old, but was ready to make her win No. 6 in her hot streak.

"She's an incredible champion, has gone through a lot," Collins said. "We had a really great battle a couple weeks ago, one of the best matches I've played. I didn't even win that match. So very familiar with her. Looking forward to the next match."

Kvitova recalled Collins having a chance to serve out that match in Brisbane, and said she would need to be better to win again.

But on second thought, she said: "It's a semifinal, so, who cares?"

"I always wanted to come back and play on the highest level, compete with the best, play the Grand Slams, actually be very deep in the Grand Slam, which is happening," Kvitova said of her second-time-around run to the semifinals. "Yeah, it just took me a bit to the tears, but it was happy tears, for sure."

The Associated Press contributed to this report.