Grigor Dimitrov has made a career out of promising much but failing to deliver, while Garbine Muguruza follows Grand Slam breakthroughs with slumps. Until now.This week’s Tennis Podcast discusses their impressive victories in Cincinnati and wonders whether they could be the forerunners to even bigger wins at the US Open, which starts next week.With Novak Djokovic, Stan Wawrinka and Kei Nishikori all out injured, and question marks over the fitness of Roger Federer and Andy Murray, is this Dimitrov’s time to shine? Could the man he beat in the final - Nick Kyrgios - make a run of his own? And wasn’t he supposed to be injured?Is Muguruza now a clear favourite for the women’s title? And what happened to Simona Halep in the final when she was just one match away from reaching World No.1? The podcast team also discuss the return of Rafael Nadal to World No.1, the US Open wild card given to Maria Sharapova, the likelihood of Andy Murray featuring in New York, and the sad case of Melanie Oudin.The Tennis Podcast is a downloadable tennis radio show, available on all platforms, including iPhones, iPads and Android phones and tablets. 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. Twitter - www.twitter.com/TennisPodcastFacebook - www.facebook.com/TheTennisPodcastInstagram - www.instagram.com/TheTennisPodcast See acast.com/privacy for privacy and opt-out information.