Tye Smith returned a blocked field goal 63 yards to snap a fourth quarter tie, and Ryan Tannehill added his second touchdown pass two minutes later, as the visiting Tennessee Titans rallied Sunday for a 31-17 win over the Indianapolis Colts.Tennessee (7-5) won for the fifth time in six games, avenging a September home loss to the Colts (6-6), and moved within a half-game of Houston for first place in the AFC South. The Texans host New England on Sunday night.With the game tied at 17, Adam Vinatieri tried a 46-yard field goal to put Indianapolis ahead. But Dane Cruickshank surged through the right side to snuff the kick, and Smith sprinted untouched to the end zone with 5:02 left. It was the second field-goal attempt blocked by Tennessee in the game.Logan Ryan intercepted Jacoby Brissett on the Colts’ second play after Smith’s return. Three plays later, Tannehill hit Kalif Raymond off play-action for a 40-yard scoring strike with 3:02 remaining, sealing Indianapolis’ fourth loss in five games.Tannehill went 17 of 22 for 182 yards and two touchdowns, playing to a quarterback rating of 131.3. The Titans are 5-1 since he supplanted Marcus Mariota as the starter after a Week 6 shutout loss in Denver.Brissett completed 25 of 40 passes for 319 yards with a touchdown and two interceptions. His score came on the game’s first possession, as he found tight end Jack Doyle for a 21-yard connection with just 3:57 elapsed.