Mueller won his first World Series of Poker title in 2009 in the $10,000 limit Texas hold'em championship. Mueller won his second World Series of Poker bracelet and $194,909 only 11 days after his first in a $1,500 Limit Hold'em Shootout event. He won his third in the $10,000 H.O.R.S.E. championship at the 2019 WSOP.