Serena Williams made history by winning a 23rd Grand Slam singles title, and then the tennis world's attention turned to Roger Federer vs. Rafael Nadal. In the Day 13 Tennis Podcast from the Australian Open, Catherine Whitaker (Eurosport) and David Law (BBC 5 Live) convened to look back and ahead. What was the match like between Serena and Venus? How big an achievement is a 23rd Slam? Will she break Margaret Court's number of 24? And how long will she continue to play?As we look ahead to Rafael Nadal vs. Roger Federer, Catherine interviews John McEnroe, David speaks to Boris Becker, and we hear from Federer, interviewed by Mats Wilander for Eurosport.A Tennis Podcast, produced in association with Telegraph Sport and Eurosport, will be available to download after the men's singles final on Sunday. See acast.com/privacy for privacy and opt-out information.