Courtesy of Damon Martin and official MMAWeekly.com content partner Bleacher Report . After 45 professional fights, with nine of them taking place in the UFC , veteran lightweight Aaron Riley retired from the sport on Saturday night. Riley competed at the UFC on Fox 8 show where he lost a split decision to Justin Salas. Following the bout, Riley took to Twitter to announce that his fight in Seattle was the last of his 16-year career. Fight my last MMA fight tonight. It’s been fun but after 16 years I’m calling it good