David Howman: former World Anti-Doping Agency director general on Jannik Sinner returning after steroid scandal

World tennis number one Jannik Sinner is after a fresh start heading into the final grand slam of the season. The Italian has fired his physio and fitness trainer on the eve of the US Open, which starts at Flushing Meadow this week, after he tested positive for a banned substance through accidental contamination.  Former WADA director general David Howman outlined the controversy with Piney. LISTEN ABOVESee omnystudio.com/listener for privacy information.