Jermell Charlo has legacy, not money, on his mind in fight for undisputed status with Brian Castano

Charlo is seeking more respect for his accomplishments in the ring as he looks to secure all four major titles at 154 pounds

After having flirted with the periphery of the sport's top 10 pound-for-pound list throughout two reigns as 154-pound titleholder, the only thing unified super welterweight champion Jermell Charlo has seemingly lacked up to this point is a defining victory.   At 31, it would be hard to find anyone disputing whether Charlo (34-1, 18 KOs) and his sublime combination of power and speed is world class. Charlo made a strong case for consideration as the sport's best 154-pounder last fall when he co-headlined his first pay-per-view card (alongside twin brother Jermall) and knocked out Jeison Rosario to unify a trio of world titles. His lone defeat -- a disputed decision against Tony Harrison in 2018 -- was avenged the following year by knockout.   So what about that defining fight to cement himself as one of the best super middleweight champions of the modern era? Charlo gets his shot for just that on Saturday when he defends his WBC, WBA and IBF titles against unbeaten WBO titleholder Brian Castaño inside AT&T Center in San Antonio (Showtime, 9 p.m. ET) to declare the first undisputed champion at 154 pounds in the four-belt era.