For the first time in the Open Era there will be a Japanese man and woman in the semi-finals of a Grand Slam after contrasting wins for Naomi Osaka and Kei Nishikori.Osaka was brilliant again, cruising past an out-of-sorts Lesia Tsurenko. Is she playing the best tennis of anyone in the draw?Nishikori then reeled in Marin Cilic to win in five sets. Was he inspired by Osaka’s victory? Not for the first time, Cilic suffered an alarmingly sudden loss of form and became very agitated. Why does this keep happening?In the night session, David and Catherine lament the 'disrespectful' crowd noise during the Madison Keys vs. Carla Suarez Navarro match. Could the umpire have done more? Does the US Open need to embrace the power of silence?Despite the atmosphere, Keys played well again. Will she beat Osaka tomorrow? In the other women’s semi-final, are there any weaknesses with Serena’s movement that Sevastova could expose?In the Djokovic vs. Millman match, which Djokovic won pretty comfortably in the end, there was a bizarre moment when the match stopped to allow Millman to change his clothes. What was going on?Finally, Catherine reflects on a day in the Amazon Prime Video studio with Jimmy Connors. Who is the 5-time US Open champion predicting to win the men’s title? And does he feel protective of his long-standing records?There will be 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.