Caroline Wozniacki has looked anything but a Grand Slam finalist this year, but her excellent form has continued at the US Open and she will clash with Angelique Kerber on Thursday.  Catherine Whitaker and David Law took to the 5 Live commentary box to talk about it, and to preview Andy Murray's quarterfinal with Kei Nishikori. Catherine reveals some insight from a Nishikori/Chang practice session, and how Ivan Lendl threw them off the court, and then David reflects on a night-session that was all a bit of damp squib.  Novak Djokovic reached the semifinals of the US Open after his third opponent of the fortnight failed to finish. The Tennis Podcast is produced in association with Telegraph Sport. See acast.com/privacy for privacy and opt-out information.