Tamura bounced back from his title loss representing RINGS in the Colosseum 2000 event, where he was pitted against Jeremy Horn. The bigger American managed to difficult Tamura's takedowns, but the Japanese gained dominance with striking despite not wearing gloves (which forced him to use only open-handed strikes). At the second round, action slowed down in Tamura's butterfly guard, and although the American passed it at the last minutes and sought to establish a submission, time went out for a decision win for Tamura. In August 2000, Tamura fought as well Pat Miletich, Horn's teammate. Unlike the previous match, Tamura controlled the striking, landing several leg kicks. The contenders exchanged takedowns at both rounds, but Tamura achieved positional control more often, thus winning a majority decision.