Cai and Fu were pitted against Danish veterans Jens Eriksen and Martin Lundgaard Hansen, who stopped them from entering the semifinals at Athens Olympics.

    The Danish pair, however, retreated to their low ebb recently due to their age disadvantage. Hansen is 35 years old, while his partner Eriksen, aged 38, is the most experienced shuttler for the tournament.

    But Cai didn't underestimate the stamina of the Danish veterans, who claimed they are still in good form after training on Tuesday, even better when compared with Athens.

    "All pairs who succeeded in seating themselves at the tournament are very strong. Men's doubles games are very open, and every pair has a chance to win," said Cai, who will play his first match on August 12 at the Beijing University of Technology Gymnasium.