Former world champion women's wrestler Seiko Yamamoto has decided to come out of retirement, her management company said Tuesday.

Yamamoto, who retired in July 2006, is scheduled to formally announce her comeback at a press conference on Wednesday.

The 28-year-old was a four-time world champion but failed to secure a berth in the 55-kg weight class at the 2004 Athens Olympics after a defeat to Saori Yoshida.

Disappointment struck again when she failed to secure a ticket to the 2006 world championships in Guangzhou, China, at 59 kg.

After entering retirement, Yamamoto gave birth to a baby boy with her husband Hideaki Nagashima, who is a member of the Japanese national handball team.

Yamamoto comes from a family of wrestlers, starting with her father Ikuei who competed in the 1972 Munich Olympics.

Her elder brother Norifumi "Kid" Yamamoto, who missed out on a spot at the Beijing Olympics last summer after a seven-year hiatus from amateur wrestling, is active as a mixed martial arts fighter.