Wladimir Sidorenko of Ukraine (R) is punched by Nobuto Ikehara of Japan during their World Boxing Association (WBA) bantamweight title in Osaka, western Japan, January 10, 2008. REUTERS/Toru Hanai (JAPAN) 

Wladimir Sidorenko of Ukraine (L) punches Nobuto Ikehara of Japan during their World Boxing Association (WBA) bantamweight title bout in Osaka, western Japan, January 10, 2008. REUTERS/Toru Hanai (JAPAN) 

Wladimir Sidorenko of Ukraine (L) celebrates after defeating Nobuto Ikehara (R) of Japan during their World Boxing Association (WBA) bantamweight title bout in Osaka, western Japan, January 10, 2008. REUTERS/Toru Hanai (JAPAN) 

Wladimir Sidorenko of Ukraine (R) is punched by Nobuto Ikehara of Japan during their World Boxing Association (WBA) bantamweight title bout in Osaka, western Japan, January 10, 2008. REUTERS/Toru Hanai (JAPAN) 

Wladimir Sidorenko of Ukraine (R) is punched by Nobuto Ikehara of Japan during their World Boxing Association (WBA) bantamweight title bout in Osaka, western Japan, January 10, 2008. REUTERS/Toru Hanai (JAPAN) 

Wladimir Sidorenko of Ukraine (C) celebrates after defeating Nobuto Ikehara of Japan during their World Boxing Association (WBA) bantamweight title bout in Osaka, western Japan, January 10, 208. REUTERS/Toru Hanai (JAPAN) 

Wladimir Sidorenko of Ukraine (R) punches Nobuto Ikehara of Japan during their World Boxing Association (WBA) bantamweight title bout in Osaka, western Japan January 10, 2008. REUTERS/Toru Hanai (JAPAN) 

France's Jerome Arnould (R) fights against Russia's Wladimir Sidorenko during their WBA men's batamweight championship in Marseille June 29, 2007. REUTERS/Philippe Laurenson (FRANCE) 

French Jerome Arnould (L) and Russia's Wladimir Sidorenko pose after their WBA men's batamweight championship boxing match in Marseille, June 29, 2007. REUTERS/Philippe Laurenson (FRANCE) 

French Jerome Arnould (L) fights against Russia's Wladimir Sidorenko during their WBA men's batamweight championship boxing match in Marseille, June 29, 2007. REUTERS/Philippe Laurenson (FRANCE) 

Panama's Bantamweight boxer Ricardo Cordoba (R) delivers a punch to Ukrainian boxer Wladimir Sidorenko during their WBA World Championships fight in Stuttgart March 17, 2007. REUTERS/Michael Dalder (GERMANY) 

Panama's Bantamweight boxer Ricardo Cordoba (L) delivers a punch to Ukrainian boxer Wladimir Sidorenko during their WBA World Championships fight in Stuttgart March 17, 2007. REUTERS/Michael Dalder (GERMANY) 

Zarate of Mexico reacts after losing his title to Sidorenko of Ukraine during their WBA bantamweight championship fight in Hamburg. Julio Zarate (L) of Mexico reacts after losing his title to Wladimir Sidorenko of Ukraine during their World Boxing Association (WBA) bantamweight championship fight in Hamburg February 26, 2005. Sidorenko defeated Zarate in a twelve round fight. REUTERS/Christian Charisius 

Sidorenko of Ukraine lands a punch on Zarate of Mexico during their WBA bantamweight championship fight in Hamburg. Wladimir Sidorenko (L) of Ukraine lands a punch on Julio Zarate of Mexico during their World Boxing Association (WBA) bantamweight championship fight in Hamburg February 26, 2005. Sidorenko defeated Zarate in a twelve round fight. REUTERS/Christian Charisius 

Sidorenko of Ukraine celebrates his victory with his coach Timm during the WBA bantamweight championship in Hamburg. Wladimir Sidorenko of Ukraine celebrates with his coach Michael Timm after defeating title holder Julio Zarate of Mexico in a World Boxing Association (WBA) bantamweight championship fight in Hamburg February 26, 2005. Sidorenko defeated Zarate in a twelve round fight. REUTERS/Christian Charisius 

Zarate from Mexico poses with Sidorenko from Ukraine during weigh-in ahead of bantamweight championship bout in Hamburg. Julio Zarate from Mexico poses with Wladimir Sidorenko (L) from Ukraine during the official weigh-in ahead of their Bantamweight fight in Hamburg February 25, 2005. Zarate will fight Sidorenko in a World Boxing Association (WBA) bantamweight championship bout on February 26 in the northern German town of Hamburg. REUTERS/Christian Charisius