When Mirjana Lucic-Baroni served out her victory at the Australian Open on Wednesday, making the unlikeliest of returns to the semifinals of a Grand Slam after nearly 18 years, she fell to her knees, placed her forehead on the court and wept

One Swiss man, one American woman guaranteed to reach Australian Open finals, with 30-somethings crowding Thursday's semifinal lineups

Rafael Nadal has beaten Milos Raonic 6-4, 7-6 (7), 6-4 to reach the Australian Open semifinals, returning to the last four at a Grand Slam tournament for the first time since winning the 2014 French Open

On the court, CoCo Vandeweghe is all bluster and bravado, an all-or-nothing ball striker with a booming forehand who compares herself to a freight train and shrugs (literally) when she upsets the top player in the world

For all their Grand Slam successes, Venus Williams and Roger Federer still find themselves surprised to be in the semifinals at the Australian Open

Roger Federer has advanced to the Australian Open semifinals with a 6-1, 7-5, 6-2 win over Mischa Zverev, the player who eliminated top-seeded Andy Murray from the tournament two nights earlier

Jordan Thompson will make his debut for Australia when the team takes on Czech Republic in a Davis Cup World Group opening round on hardcourts at Kooyong Lawn Tennis Club from Feb. 3-5

Australian Open quarterfinalists Serena Williams and Johanna Konta have never met on a tennis court, but Konta knows the American well _ from watching Williams play when the Australian-born British player was a youngster and in her teens

Andy Roddick won the U.S. Open, reached the final of Wimbledon three times and was a fixture in the top 10 for much of his career