Osaka's Stand, US Open Preview and the great David Mercer

Former Sunday Times tennis correspondent Barry Flatman joins Finn to talk Osaka's stand and Pospisil's new players' union. There is also a comprehensive US Open preview: is Djokovic's only enemy himself? Is Serena Williams a favourite? How will Sofia Kenin embrace being top dog? Barry also gives his memories of the great David Mercer, former umpire and legendary BBC commentator, who sadly passed away this week. Music