Don Ezra Nicholas, 19, packed in three "and a bit" McDonalds hamburgers, or 369 grams (13 ounces) of burger, into his mouth without swallowing, the Straits Times said.
His effort on Sunday took him past the feat of American Johnny Reitz, who previously held the record by stuffing 340 grams of hamburger into his mouth.
"I'm the burger king," Nicholas, a national serviceman, declared after his world record, adding his achievement did not come easily.
"I couldn't see or hear anything. I couldn't breathe for a while. At one point I almost gagged."
On Saturday, Jeffery Koh, 50, the oldest participant in the 10-team contest, broke the world record for eating three cream crackers in the fastest time.
He polished off the crackers in 14.45 seconds, beating the previous record of 49.15 seconds held by Briton Ambrose Mendy in 2002.
Some of the failed record attempts on the weekend included downing a 397 gram (14 oz) bottle of ketchup with a straw in the fastest time, eating the most number of Smarties with a pair of chopsticks in three minutes and speaking the most number of words backwards in one minute.
Ten pairs
