Banks had his man wobbling in the third round after connecting with a clean right jab but was unable to put the former Michigan State Spartan on the canvas.
The encounter promised action but only delivered in very brief spurts, causing the sell-out crowd to often boo both fighters in what was a very disappointing and lacklustre fight.
Mitchell did score an official knockdown in round three with a heavy right uppercut, but replays showed it was a debatable call.
Banks battled back in the third round, catching his opponent with a flurry of hard right hands that had Mitchell wobbling and holding out for the bell.
It came to his rescue and from there on in Banks eased off, seemingly content to stand, cover up and wait on counter opportunities that never came because Mitchell wasn’t his usual reckless self.
The final scores read 114-112, 115-112, and 117-109 in Mitchell's favour.
"I felt confident that I won," Mitchell said.
"Banks was looking to counter punch only. I had to stick to my plan and be smart and be disciplined. I felt I easily won eight of the 12 rounds."
- Sports & Recreation