On a day of extreme heat and humidity at the US Open, when merely breathing was a challenge, Simon Briggs of Telegraph Sport joins David to salute all the players that managed to actually play high-level tennis in such brutal conditions.The decision of the tournament organisers to invoke the heat rule, including one for the men, is praised. But should play have been cancelled altogether?Novak Djokovic was one of a number of players to be seriously affected by the weather, but he battled through in four sets. Djokovic certainly looked exhausted, but isn’t it a good sign that he’s no longer hiding his emotions on court? Elsewhere, David and Simon pick up the pieces from Jo Konta’s straight-sets defeat to No. 6 seed Caroline Garcia. Does Konta need a plan B? Why has her serve become less effective? And how much longer will her coaching relationship with Michael Joyce last?In the night session, Roger Federer cruised through against Yoshihito Nishioka and Maria Sharapova held off Patty Schnyder’s mini-fightback. Finally, there’s a preview of Andy Murray’s second round match against Fernando Verdasco. Murray owns a 13-1 head-to-head record. But conditions are set to be even worse on Wednesday. Who will that favour?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.