There are plenty of storylines worth following over the next two weeks, but one underlying theme in the run-up to the tournament is who is no longer playing tennis — and who will be joining them in retirement soon. Sam Stosur, the 2011 U.S. Open singles champion and owner of four other Grand Slam titles in women’s doubles, already had stopped playing singles but says she will quit doubles after this Australian Open. Sania Mirza, who has won three Grand Slam titles apiece in women’s doubles and mixed doubles, said this event will mark the end of the road for her, too. Their departures follow more high-profile ones in 2022 from Serena Williams, Roger Federer and Ash Barty, who won the Australian Open last January and stepped away in March at age 25. Others who retired last season included Andrea Petkovic, Monica Puig, Kirsten Flipkens, CiCi Bellis, Christina McHale, Juan Martin del Potro, Jo-Wilfried Tsonga, Kevin Anderson, Sam Querrey and Gilles Simon.