After few years out of the K-1 fighting circuit Brecht Wallis made his comeback on 4 May 2007 at the K-1 Fighting Network GP 2007 in Romania, winning the tournament over Doug Viney, Errol Zimmerman and Paula Mataele and he qualified for K-1 World GP 2007 in Amsterdam.
On 4 May 2007, he took part in the eight-man tournament at K-1 Fighting Network Romania 2007 and was defeated in the quarter-finals by Brecht Wallis.
He stopped Imani Lee with a barrage of unanswered punches in round three in the quarter-finals but was unable to continue in the tournament due to a leg injury and was replaced by Doug Viney, who eventually went on to win the title.
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