A day that began with Roger Federer looking serene ended with him out of the tournament, Rafael Nadal fighting through at the last, and David Law speaking to a couple of special guests - BBC commentators Vassos Alexander and Russell Fuller - to try to cover it all on The Tennis Podcast.Federer was felled by Kevin Anderson, who saved match point and came back from two sets to love down to overcome Federer in 5. Was it a question of sensational play from the South African, or did Federer look short of his best? Did the change in scenery for Federer on Court One bother him after 19 successive Centre Court appearances?  Nadal vs. Juan Martin del Potro was described by Andy Murray in the BBC commentary box as one of the best matches he has ever seen ‘live’, and it was hard to argue. Del Potro led two sets to one, but Nadal came back to win it in a marathon 5th set. Where was the match won and lost? Will Del Potro ever win another Slam? Is Nadal about to win Wimbledon and close the gap on Federer to just two major titles?Nadal will face Djokovic, who looked pretty sprightly in a four-set win over Kei Nishikori. Is Djokovic now back to his best? Will he beat Nadal?Isner bravely fought past Milos Raonic in four sets, from a set down. Could this be the 33-year-old’s time?Law, Alexander and Fuller all look ahead to the women’s semifinals and give their predictions for Angelique Kerber vs. Jelena Ostapenko and Serena Williams vs. Julia Goerges. The Tennis Podcast is produced daily throughout Wimbledon, presented by David Law and Catherine Whitaker.It is produced in associated with Telegraph Sport and sponsored by Amazon Prime Video, the new home of the US Open in the UK. See acast.com/privacy for privacy and opt-out information.