Keith Thurman is ready for another crack at Manny Pacquiao -- telling TMZ Sports straight-up, "I'm ready for the rematch!"
The boxing star was out at Avra in Beverly Hills -- the first time we've seen him since losing to PacMan by split decision after their July 20 war in Vegas. The fight was great.
30-year-old Thurman was in pretty good spirits considering he's still nursing the first loss of his pro career ... but says he REFUSES to cry about it because, "I got paid!"
Thurman says he's got nothing but respect for 40-year-old Pacquaio -- and was super impressed by his skills in the ring -- but claims the judges got it WRONG on the scorecards.