[1] He is a former multiple-time national record holder for the men's butterfly, and a six-time medalist at the Southeast Asian Games.

He is also a two-time defending champion for the 200 m butterfly, before losing out to Malaysia's Daniel Bego at the 2007 Southeast Asian Games in Bangkok, Thailand.

[2] Utomo made his first Indonesian team at the 2004 Summer Olympics in Athens, where he competed in the men's 200 m butterfly.

After winning a silver medal from SEA Games in Bangkok, Thailand, his entry time of 2:00.81 was officially accredited under a FINA B-standard.

[5][6] He challenged seven other swimmers in heat two, including his former rival James Walsh of the Philippines, and four-time Olympian Vladan Marković of the newly independent nation Serbia.