Lucas Martín Matthysse (; born 27 September 1982) is an Argentine former professional boxer who competed from 2004 to 2018. He held the WBA (Regular) welterweight title in 2018 and the WBC interim super lightweight title from 2012 to 2013. Matthysse was known for his aggressive pressure fighting style and formidable punching power. He is the brother of former world champion Edith Soledad Matthysse and former professional boxer Walter Matthysse. Amateur career During his amateur career, Matthysse fought in the 2003 Pan American Games at Santo Domingo, Dominican Republic, where he went on to stop Colombia's Breidis Prescott in just the first round. Lucas has faced Marcos Maidana four times in the amateurs with Maidana winning three times while fighting the fourth to a draw. Professional career Light welterweight In June 2004, Lucas won his pro debut against Leandro Almagro, on a card that also featured his brother Walter. Matthysse vs. Judah On 6 November 2010 Matthysse lost a very disputed split decision against former world champion Zab Judah in the main event of an HBO card. Judah began the busier fighter, using the jab and trying to land uppercuts for the first two rounds, while Matthysse worked on the body. In round three, a clash of heads opened a cut outside of the left eye of Judah. Matthysse displayed more aggression and became the aggressor in the third and the fourth round and Judah switched to a defensive tactic. In the next two rounds, the American boxer picked up the pace, beginning to land more combinations. Judah continued to box throughout the ninth round but Matthysse began to show more power in the tenth, focusing on the head of his opponent and knocking down the American boxer after a hard right hand to the jaw. Judah got up, but he was hurt. The Argentine fighter tried to press the attack after the knockdown. Two judges scored the fight 114–113 for Judah, while the other judge scored it 114–113 for Matthysse. Matthysse vs. Alexander On 25 June 2011 Matthysse faced former world champion Devon Alexander and lost another close, but hugely controversial split decision. The judges in the Family Arena in St. Charles had the fight 96–93 and 95–94 for Alexander, and 96–93 for Matthysse. Matthysse vs. Martínez, Soto and Olusegun Lucas was forced to withdraw from a fight versus Erik Morales in one of the featured bouts on the