Jannik Sinner conquered mental challenge to claim US Open title

Jannik Sinner came into the US Open under a cloud but was the eventual champion (Seth Wenig/AP)

Jannik Sinner was proud of his mental strength after putting his anti-doping scandal behind him to win the US Open for the first time.

The world number one came into the tournament shrouded in controversy after escaping a ban, despite two positive tests in March.