After all the off-court drama of the past few days, the excitement on day five at the US Open was to be found on the court. David is joined separately by Simon Briggs and Catherine to talk about it all.Serena vs. Venus was a remarkable occasion, as expected, but Serena’s brilliance made it a one-sided contest. Has she sent a message to the rest of the field?The match of the day was undoubtedly the four-hour epic between Karen Khachanov and Rafael Nadal. Is it time to raise our expectations of Khachanov? How much of a concern is Nadal’s knee for the rest of the tournament?Elsewhere, Saturday’s order of play is another cracker. Eyebrows were raised when Federer vs. Kyrgios was scheduled for the day session, but David is on hand with an explanation. Will the conditions favour either player?There will daily editions of The Tennis Podcast throughout the US Open fortnight. The Tennis Podcast is produced in association with the Telegraph 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.