LeBron James says the Cleveland Cavaliers must sharpen their mental approach after a brutal 132-98 drubbing by the Golden State Warriors. James was left a virtual spectator in his own back yard on Monday night as the Warriors inflicted the biggest home defeat of the four-time NBA MVP winner's career at Cleveland's Quicken Loans Arena. Steph Curry scored 35 points as the Warriors made a triumphant return to the scene of last season's NBA Finals triumph, outplaying the Cavaliers from start to finish.