The Cavs might have lost, but Donovan Mitchell was winning after the game -- hitting up an L.A. hotspot with his beautiful girlfriend ... and TMZ Sports has the vid!!
Cleveland lost just its second game of the season against the Clippers on Monday ... falling 117-119 and snapping an 8-game winning streak, despite Spida's 30-point effort
26-year-old Mitchell and his lady, Tinara Westbrook, decided to get over the loss at The Nice Guy in West Hollywood ... enjoying a peaceful meal late into the night.
The 3-time All-Star and hair entrepreneur have been going strong this year .