Olympic silver medallist Nathan Robertson has withdrawn from the World Championships in Anaheim, California, with an ankle injury.
Robertson and partner Gail Emms were the top seeds and won the All England Championships earlier this year,
He suffered a strained right ankle in training on Sunday and was forced out.
Their scheduled opponents Songpol Anukritayawan and Kulchala Worawichitchaikul from Thailand get a walkover into the last 16.
England's Andrew Smith crashed out at the first hurdle to Kennevic Asuncion of the Phillipines ina marathon three set encounter, 17-14 5-15 17-15.