Kenny lost to Hersony Canelon of Venezuela in the 1/16 final, the first round of sprint matches. Hersony jumped Kenny with a lap and a half to go. Kenny jumped in behind the Venezuelan but made little impression on his lead as he came up alongside him in the final straight.
"I fluffed it up." Kenny said, before claiming his qualification time was "a massive step forward" from the Commonwealth Games.
With no repechage round following the 1/16 finals Kenny's world championships are over. He was part of the British team that finished eighth in the men's team sprint and was then completely out of the running in the keirin.
It represents one of Kenny's worst performance at a world championships and compounds the woes of the British sprint squad that has been no where near medal-winning performances this week.
Great Britain's only realistic gold medal chance now rests with Laura Trott - Kenny's fiancé - in the omnium. Trott however looked off the pace in the omnium scratch race, finishing in 13th position.
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