Rafael Nadal eliminated 21-year-old American Frances Tiafoe to get back to the Australian Open semifinals

Petra Kvitova knew the question was coming after she beat Ash Barty at the Australian Open to reach a Grand Slam semifinal for the first time since she won Wimbledon in 2014

Stefanos Tsitsipas followed up his upset of Roger Federer at the Australian Open by beating Roberto Bautista Agut in 4 sets to become the youngest man to reach a Grand Slam semifinal since 2007; Danielle Collins of the US reached her first major semi, too

Li Na saw much of herself in a young player on the women's tour early last year

Pro tennis players breaking rackets is as much a part of the sport as forehands and backhands

Li Na becomes 1st player from Asia elected to International Tennis Hall of Fame

Record-chasing Novak Djokovic is feeling sore and tired following his late-finishing win over Daniil Medvedev but thinks he will be OK for his Australian Open quarterfinal match against Kei Nishikori

Kei Nishikori advanced and Pablo Carreno Busta made a screaming exit at the Australian Open after a contentious fifth-set tiebreaker in the fourth round

Serena Williams faced her first real test at this year's Australian Open and emerged with a 6-1, 4-6, 6-4 victory over No. 1-ranked Simona Halep to reach the quarterfinals

Serena Williams beats top-ranked Simona Halep to reach Australian Open quarterfinals