Guts moved up to Junior Welterweight (current Super Lightweight/Light Welterweight) in 1977, challenging Saensak Muangsurin, but was knocked out in the 6th round. Despite having moved up a weight class, Guts still had to shed 15 kg off his natural weight to make the weight-in.
Guts elevated to Junior Welterweight (current Super Lightweight/Light Welterweight) in 1977, confronting Saensak Muangsurin but was knocked out in the 6th round. Guts still had to shed 15 kg from his natural weight to meet the competition's requirements.