Semmy Schilt
From 2005 Mauricio helped train Ray Sefo at the Ichigeki Plaza in Tokyo. Some of Ray Sefo's notable titles and accomplishments while working with Mauricio include his fight in 2007 at the K-1 World Grand Prix 2007 in Yokohama against four-time World Grand Prix Champion Semmy Schilt for the new Super Heavyweight title. In Round 1, Sefo knocked Schilt down to become one of only three fighters in K-1 history to ever knock down Semmy Schilt. However, he would go on to lose by KO in round 2. Others wins include fights against Melvin Manhoef in the K-1 World Grand Prix 2006 in Tokyo Final,