© Getty Images
TY Hilton got the Colts into a strong field position in the first quarter, but Ahmad Bradshaw fumbled the ball after being tackled by Carlos Dunlap while trying to run the ball in for the touchdown, giving the ball back to the Bengals.
Cincinnati could not make the most of the turnover, allowing the home side to head back down the other end, with Adam Vinatieri kicking the opening points of the game.
Bradshaw made amends for his earlier fumble before half time, running the ball in after another Bengals drive stalled.
The Colts were dealt a blow shortly before the break though when Erik Walden was ejected in the second quarter for making contact with an official.
Andy Dalton and the Cincinnati offense continued to struggle in the third quarter, while Luck made a short pass out wide for Dwayne Allen, and the tight end went unchallenged as he sprinted to the endzone.
Bradshaw continued to stretch the Bengals offense, picking up lateral ball from Luck before powering over for his second score of the day.
Dalton was unable to build any momentum for the Bengals, finishing the game with just 126 passing yards, while Giovani Bernard managed just 17 rushing yards.
The result leaves the Colts in control in the AFC South with a 5-2 record, while the Bengals lose the lead in the AFC North.