In July 2006 he placed 9th in the 143-player 8-handed World Series of Poker $50,000 H.O.R.S.E. event, taking home $205,920, his biggest cash that year. In the 2007 World Series of Poker, Antonius entered numerous tournaments but he only cashed in the World Championship of Pot Limit Omaha event, placing third and winning $311,394, making that his ninth WSOP cash and increasing his WSOP earnings to a total of $569,964. Antonius has been featured three times on NBC's Poker After Dark. In his first appearance, he finished as runner up, losing out to fellow poker professional Jennifer Harman, but his next attempt saw him defeat Brad Booth in heads-up play to take the victory. In his third appearance he was runner up again, this time to Johnny Chan. , Antonius' total live tournament winnings exceed $ 6,775,000. His 14 cashes at the WSOP account for $911,178 of those winnings.