He started to play when he was 7. His first coach was his mother Alina. Wilfredo León Venero debuted in the Cuban national team on May 24, 2008 in Düsseldorf, aged 14 years and 10 months. He won the title of Best Receiver at World League 2009. On July 31, 2009 he won a silver medal in the World U21 Championship 2009 (after losing the final against Brazil). In 2009, the Cuban national team, with Leon, won the title of NORCECA Champion (and three individual awards) and repeated this success in 2011. After losing the final against Brazil, Cuba won a silver medal at the World Championship 2010. He was the youngest captain of the national team (he was 17). In 2012, he won bronze medal of World League - Sofia 2012.