Juan Martin del Potro produced one of the most extraordinary comebacks the US Open has ever seen on Monday night, and The Tennis Podcast team were there to witness it.Presenters Catherine Whitaker (Eurosport) and David Law (BBC 5 Live) looked back on the match which saw the Argentine go two sets to love behind after winning only three games, nearly retiring because of a virus, saving two match points, and then coming all the way back to win in the most pulsating manner imaginable. Del Potro will now face Federer in a rematch of their 2009 final. On paper, Federer’s straight sets win over Philip Kohlschreiber was no cause for concern, but he did depart the court at the end of the second set to have some brief treatment to his lower back, and Law and Whitaker witnessed his unusually late walk to speak to the media. ‘It was just a precaution. I’m not worried,” he said afterwards. Elsewhere, Rafael Nadal produced what Whitaker described as ‘a statement performance’ - a straight sets win over Alexander Dolgopolov - and will now meet exciting 19-year-old Andrey Rublev in the quarterfinals. On the women’s side, World No.1 Karolina Pliskova won in just 46 minutes against Jennifer Brady, and with a possible all-American semifinal line-up bubbling, Whitaker, on Eurosport duty, was invited into the player box to talk to the coach of Coco Vandeweghe - Pat Cash. He explained how Vandeweghe is producing so many impressive wins on her way to the quarterfinals.A new edition of The Tennis Podcast is available to download after play every day during the US Open. Presented by broadcasters Catherine Whitaker (Eurosport, BBC 5 Live) and David Law (BBC 5 Live, BT Sport), it is produced weekly throughout the year, and daily at the Grand Slam tournaments, in association with Telegraph Sport and Eurosport.  See acast.com/privacy for privacy and opt-out information.