Federer vs. Kyrgios may not have lived up to our lofty expectations, but it still delivered a number of talking points for Catherine and David on The Tennis Podcast.It was neither a total capitulation nor a fully-engaged performance from Kyrgios. Why does Catherine believe it was a step backwards? Will he finally get a coach?Federer, meanwhile, produced a shot of genius. You must have seen it. Where does it rank in his long list of memorable moments?Elsewhere, it was a day laden with upsets. The defeats of Angelique Kerber, Caroline Garcia, Lucas Pouille and Alexander Zverev are discussed. David is refusing to talk about Petra Kvitova…Were we expecting too much too soon from the Lendl-Zverev partnership? When will the German solve the Grand Slam conundrum?The devastating form of Naomi Osaka also gets a mention. She’s won three 6-0 sets in a row! 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.