Ex-world number one Peter Gade began his campaign at the World Championships by crushing Pedro Yang 15-0 15-1. "I feel my form is better than ever," said the Dane, runner-up at the 2001 Worlds, after beating the Guatemalan. "My motivation is still high."
Unseeded Shoji Sato of Japan accounted for number 12 seed Dicky Palyama of the Netherlands 15-10 15-8.
Singapore's Ronald Susilo was cruising to victory against France's Olivier Fossy when he snapped a tendon.
In the women's singles in Anaheim, Canada's Charmaine Reid rolled over Slovenia's Maja Tvrdy 11-6, 11-1.