Boxing - Akira Yaegashi of Japan v Wittawas Basapean of Thailand - IBF World light flyweight title - Ariake Colosseum, Tokyo, Japan - 30/12/16. Akira Yaegashi of Japan and Wittawas Basapean of Thailand in action. REUTERS/Toru Hanai 

Boxing - Akira Yaegashi of Japan v Wittawas Basapean of Thailand - IBF World light flyweight title - Ariake Colosseum, Tokyo, Japan - 30/12/16. Akira Yaegashi of Japan reacts to his children after defeating Wittawas Basapean of Thailand. REUTERS/Toru Hanai 

Boxing - Akira Yaegashi of Japan v Wittawas Basapean of Thailand - IBF World light flyweight title - Ariake Colosseum, Tokyo, Japan - 30/12/16. Akira Yaegashi of Japan reacts to his children after defeating Wittawas Basapean of Thailand. REUTERS/Toru Hanai 

Boxing - Akira Yaegashi of Japan v Wittawas Basapean of Thailand - IBF World light flyweight title - Ariake Colosseum, Tokyo, Japan - 30/12/16. Akira Yaegashi of Japan and Wittawas Basapean of Thailand in action. REUTERS/Toru Hanai 

Boxing - Akira Yaegashi of Japan v Wittawas Basapean of Thailand - IBF World light flyweight title - Ariake Colosseum, Tokyo, Japan - 30/12/16. Akira Yaegashi of Japan and Wittawas Basapean of Thailand in action. REUTERS/Toru Hanai 

Boxing - Akira Yaegashi of Japan v Wittawas Basapean of Thailand - IBF World light flyweight title - Ariake Colosseum, Tokyo, Japan - 30/12/16. Akira Yaegashi of Japan reacts with his children after defeating Wittawas Basapean of Thailand. REUTERS/Toru Hanai 

Boxing - Akira Yaegashi of Japan v Wittawas Basapean of Thailand - IBF World light flyweight title - Ariake Colosseum, Tokyo, Japan - 30/12/16. Akira Yaegashi of Japan reacts after defeating Wittawas Basapean of Thailand. REUTERS/Toru Hanai 

Boxing - Akira Yaegashi of Japan v Wittawas Basapean of Thailand - IBF World light flyweight title - Ariake Colosseum, Tokyo, Japan - 30/12/16. Akira Yaegashi of Japan and Wittawas Basapean of Thailand in action. REUTERS/Toru Hanai 

Boxing - Akira Yaegashi of Japan v Wittawas Basapean of Thailand - IBF World light flyweight title - Ariake Colosseum, Tokyo, Japan - 30/12/16. Akira Yaegashi of Japan and Wittawas Basapean of Thailand in action. REUTERS/Toru Hanai 

Boxing - Akira Yaegashi of Japan v Martin Tecuapetla of Mexico - IBF light flyweight title - Ariake Coliseum, Tokyo, Japan - 8/5/16. Akira Yaegashi of Japan and Martin Tecuapetla of Mexico in action. REUTERS/Thomas Peter 

Boxing - Akira Yaegashi of Japan v Martin Tecuapetla of Mexico - IBF light flyweight title - Ariake Colosseum, Tokyo, Japan - 8/5/16. Akira Yaegashi of Japan after defeating Martin Tecuapetla of Mexico. REUTERS/Thomas Peter 

Boxing - Akira Yaegashi of Japan v Martin Tecuapetla of Mexico - IBF light flyweight title - Ariake Colosseum, Tokyo, Japan - 8/5/16. Akira Yaegashi of Japan and Martin Tecuapetla of Mexico in action. REUTERS/Thomas Peter 

Boxing - Akira Yaegashi of Japan v Martin Tecuapetla of Mexico - IBF light flyweight title - Ariake Colosseum, Tokyo, Japan - 8/5/16. Akira Yaegashi of Japan and Martin Tecuapetla of Mexico in action. REUTERS/Thomas Peter 

Boxing - Akira Yaegashi of Japan v Martin Tecuapetla of Mexico - IBF light flyweight title - Ariake Colosseum, Tokyo, Japan - 8/5/16. Akira Yaegashi of Japan and Martin Tecuapetla of Mexico in action. REUTERS/Thomas Peter 

Boxing - Akira Yaegashi of Japan v Martin Tecuapetla of Mexico - IBF light flyweight title - Ariake Colosseum, Tokyo, Japan - 8/5/16. Akira Yaegashi of Japan and Martin Tecuapetla of Mexico in action. REUTERS/Thomas Peter 

Boxing - Akira Yaegashi of Japan v Martin Tecuapetla of Mexico - IBF light flyweight title - Ariake Colosseum, Tokyo, Japan - 8/5/16. Akira Yaegashi of Japan and Martin Tecuapetla of Mexico in action. REUTERS/Thomas Peter TPX IMAGES OF THE DAY

Akira Yaegashi (top) of Japan celebrates after beating Javier Mendoza of Mexico in their IBF light flyweight boxing title match in Tokyo, Japan December 29, 2015. REUTERS/Yuya Shino 

Javier Mendoza (C) of Mexico fights with Akira Yaegashi of Japan during their IBF light flyweight boxing title match in Tokyo, Japan December 29, 2015. REUTERS/Yuya Shino 

Javier Mendoza (C) of Mexico fights with Akira Yaegashi of Japan during their IBF light flyweight boxing title match in Tokyo, Japan December 29, 2015. REUTERS/Yuya Shino 

Akira Yaegashi (R) of Japan fights with Javier Mendoza of Mexico during their IBF light flyweight boxing title match in Tokyo, Japan December 29, 2015. REUTERS/Yuya Shino 

Akira Yaegashi (L) of Japan fights with Javier Mendoza of Mexico during their IBF light flyweight boxing title match in Tokyo, Japan December 29, 2015. REUTERS/Yuya Shino 

Javier Mendoza (C) of Mexico fights with Akira Yaegashi of Japan during their IBF light flyweight boxing title match in Tokyo, Japan December 29, 2015. REUTERS/Yuya Shino TPX IMAGES OF THE DAY

Akira Yaegashi of Japan celebrates after beating Javier Mendoza of Mexico in their IBF light flyweight boxing title match in Tokyo, Japan December 29, 2015. REUTERS/Yuya Shino 

Akira Yaegashi of Japan reacts after beating Javier Mendoza of Mexico in their IBF light flyweight boxing title match in Tokyo, December 29, 2015. REUTERS/Yuya Shino 

Akira Yaegashi of Japan (R) punches Pedro Guevara of Mexico during their WBC boxing light flyweight title bout in Tokyo December 30, 2014. REUTERS/Thomas Peter (JAPAN - Tags: SPORT BOXING) 

Pedro Guevara of Mexico celebrates after he beat Akira Yaegashi of Japan during their WBC boxing light flyweight title bout in Tokyo December 30, 2014. REUTERS/Thomas Peter (JAPAN - Tags: SPORT BOXING) 

Pedro Guevara of Mexico (R) punches Akira Yaegashi of Japan during their WBC boxing light flyweight title bout in Tokyo December 30, 2014. REUTERS/Thomas Peter (JAPAN - Tags: SPORT BOXING) 

Pedro Guevara of Mexico (top) reacts after he beat Akira Yaegashi of Japan during their WBC boxing light flyweight title bout in Tokyo December 30, 2014. REUTERS/Thomas Peter (JAPAN - Tags: SPORT BOXING) 

Pedro Guevara of Mexico (R) punches Akira Yaegashi of Japan during their WBC boxing light flyweight title bout in Tokyo December 30, 2014. REUTERS/Thomas Peter (JAPAN - Tags: SPORT BOXING) 

Pedro Guevara of Mexico celebrates after he beat Akira Yaegashi of Japan during their WBC boxing light flyweight title bout in Tokyo December 30, 2014. REUTERS/Thomas Peter (JAPAN - Tags: SPORT BOXING TPX IMAGES OF THE DAY) 

Pedro Guevara of Mexico celebrates after the referee counted out Akira Yaegashi of Japan during their WBC boxing light flyweight title bout in Tokyo December 30, 2014. REUTERS/Thomas Peter (JAPAN - Tags: SPORT BOXING) 

Roman Gonzalez, world boxing champion, greets to supporters during his arrival the at Intenational airport in Managua September 7, 2014. Gonzalez returns to Nicaragua after defeating Akira Yaegashi of Japan during their WBC flyweight boxing title bout in Tokyo on September 5. REUTERS/Oswaldo Rivas (NICARAGUA - Tags: SPORT BOXING) 

Roman Gonzalez, world boxing champion, greets to supporters during his arrival the at Intenational airport in Managua September 7, 2014. Gonzalez returns to Nicaragua after defeating Akira Yaegashi of Japan during their WBC flyweight boxing title bout in Tokyo on September 5. REUTERS/Oswaldo Rivas (NICARAGUA - Tags: SPORT BOXING) 

Roman Gonzalez (top) of Nicaragua reacts after he knocked out Akira Yaegashi of Japan during their WBC flyweight boxing title bout in Tokyo September 5, 2014.
REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING TPX IMAGES OF THE DAY) 

Roman Gonzalez (L) of Nicaragua reacts after he knocked out Akira Yaegashi (2nd R) of Japan during their WBC flyweight boxing title bout in Tokyo September 5, 2014.
REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING) 

Roman Gonzalez (L) of Nicaragua reacts after he knocked out Akira Yaegashi (2nd R) of Japan during their WBC flyweight boxing title bout in Tokyo September 5, 2014.
REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING) 

Akira Yaegashi (L) of Japan is punched by Roman Gonzalez of Nicaragua during their WBC flyweight boxing title bout in Tokyo September 5, 2014.
REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING TPX IMAGES OF THE DAY) 

Roman Gonzalez (C) of Nicaragua reacts after defeating Akira Yaegashi of Japan during their WBC flyweight boxing title bout in Tokyo September 5, 2014.
REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING) 

Akira Yaegashi (R) of Japan is punched by Roman Gonzalez of Nicaragua during their WBC flyweight boxing title bout in Tokyo September 5, 2014.
REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING TPX IMAGES OF THE DAY) 

Roman Gonzalez (2nd L) of Nicaragua reacts as he knocked out Akira Yaegashi of Japan during their WBC flyweight boxing title bout in Tokyo September 5, 2014.
REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING) 

Akira Yaegashi (L) of Japan is punched by Roman Gonzalez of Nicaragua during their WBC flyweight boxing title bout in Tokyo September 5, 2014.
REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING) 

Akira Yaegashi (R) of Japan is punched by Roman Gonzalez of Nicaragua during their WBC flyweight boxing title bout in Tokyo September 5, 2014.
REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING) 

Roman Gonzalez (2nd L) of Nicaragua reacts as he knocked out Akira Yaegashi (C) of Japan during their WBC flyweight boxing title bout in Tokyo September 5, 2014.
REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING TPX IMAGES OF THE DAY) 

Roman Gonzalez (2nd L) of Nicaragua reacts as he knocked out Akira Yaegashi of Japan during their WBC flyweight boxing title bout in Tokyo September 5, 2014.
REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING) 

Roman Gonzalez (R) of Nicaragua reacts after defeating Akira Yaegashi of Japan during their WBC flyweight boxing title bout in Tokyo September 5, 2014.
REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING) 

Akira Yaegashi (L) of Japan is punched by Odilon Zaleta of Mexico during their World Boxing Council (WBC) flyweight title bout in Tokyo April 6, 2014. REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING) 

Akira Yaegashi (R) of Japan celebrates as his daughter Shinobu runs towards him after Yaegashi defeated Odilon Zaleta of Mexico during their World Boxing Council (WBC) flyweight title bout in Tokyo April 6, 2014. REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING TPX IMAGES OF THE DAY) 

Akira Yaegashi (L) of Japan celebrates after knocks down Odilon Zaleta (R) of Mexico during their World Boxing Council (WBC) flyweight title bout in Tokyo April 6, 2014. REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING) 

Akira Yaegashi (L) of Japan punches to knock out Odilon Zaleta of Mexico during their World Boxing Council (WBC) flyweight title bout in Tokyo April 6, 2014. REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING) 

Akira Yaegashi (L) of Japan celebrates after knocks down Odilon Zaleta (R) of Mexico during their World Boxing Council (WBC) flyweight title bout in Tokyo April 6, 2014. REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING) 

Akira Yaegashi (C) of Japan reacts after knocking out Odilon Zaleta of Mexico during their World Boxing Council (WBC) flyweight title bout in Tokyo April 6, 2014. REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING) 

Akira Yaegashi (R) of Japan punches Odilon Zaleta of Mexico during their World Boxing Council (WBC) flyweight title bout in Tokyo April 6, 2014. REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING) 

Akira Yaegashi (R) of Japan punches Odilon Zaleta of Mexico during their World Boxing Council (WBC) flyweight title bout in Tokyo April 6, 2014. REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING TPX IMAGES OF THE DAY) 

Akira Yaegashi (L) of Japan punches to knock out Odilon Zaleta of Mexico during their World Boxing Council (WBC) flyweight title bout in Tokyo April 6, 2014. REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING) 

Akira Yaegashi (C) of Japan reacts after knocking out Odilon Zaleta of Mexico during their World Boxing Council (WBC) flyweight title bout in Tokyo April 6, 2014. REUTERS/Toru Hanai (JAPAN - Tags: SPORT BOXING) 

Defending champion Akira Yaegashi of Japan reacts after winning the World Boxing Council (WBC) flyweight title boxing match against Oscar Blanquet of Mexico in Tokyo August 12, 2013. REUTERS/Yuya Shino (JAPAN - Tags: SPORT BOXING) 

Defending champion Akira Yaegashi (C) of Japan poses during a photo opportunity after winning the World Boxing Council (WBC) flyweight title boxing match against challenger Oscar Blanquet of Mexico in Tokyo August 12, 2013. REUTERS/Yuya Shino (JAPAN - Tags: SPORT BOXING) 

Challenger Oscar Blanquet of Mexico (L) punches defending champion Akira Yaegashi of Japan in the face during their World Boxing Council (WBC) flyweight title boxing match in Tokyo August 12, 2013. REUTERS/Yuya Shino (JAPAN - Tags: SPORT BOXING) 

Defending champion Akira Yaegashi (L) of Japan punches challenger Oscar Blanquet of Mexico in the face during their World Boxing Council (WBC) flyweight title boxing match in Tokyo August 12, 2013. REUTERS/Yuya Shino (JAPAN - Tags: SPORT BOXING TPX IMAGES OF THE DAY) 

Defending champion Akira Yaegashi (back) of Japan punches challenger Oscar Blanquet of Mexico in the face during their World Boxing Council (WBC) flyweight title boxing match in Tokyo August 12, 2013. Yaegashi won by judge. REUTERS/Yuya Shino (JAPAN - Tags: SPORT BOXING)