Two-time Olympic gold medalist and three-time world amateur boxing champion Zou Shiming of China works out with trainer Freddie Roach (L) at Wild Card Boxing Club for his upcoming professional boxing debut, in Los Angeles, March 20, 2013. Zou will make his professional debut April 6 in a four-round flyweight bout against Eleazar Valenzuela of Mexico at the Venetian Macao Resort in Macao. [Photo/Agencies]

Double Olympic boxing gold medallist Zou Shiming admits he has a lot to learn ahead of his professional debut next month but the Chinese flyweight enjoyed the best possible education from hall of fame trainer Freddie Roach on Wednesday.

Having bossed the amateur circuit, where he also claimed three world championships, Zou will enter the paid ranks on April 6 when he faces Mexican Eleazar Valenzuela in a four-round bout in Macau.

Zou has prepared for the contest in the United States and on Wednesday was put through his paces at Roach's famed Wild Card Boxing Club in Hollywood, California and sparred with WBA and WBO flyweight champion Brian Viloria.

Zou's amateur success was built on lightning quick hand speed, body swerving elusiveness and his ability to throw punches from all angles but that style could come unstuck against heavy-punching professionals.

Two-time Olympic gold medalist and three-time world amateur boxing champion Zou Shiming of China works out on the speed bag at Wild Card Boxing Club while preparing for his upcoming professional boxing debut, in Los Angeles, March 20, 2013. [Photo/Agencies]