Lucas Martín Matthysse 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 younger brother of welterweight contender, Walter Matthysse and former featherweight world champion of boxing, Edith Soledad Matthysse.