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Vontae Davis vs. Antonio Brown
For the Colts defense, there won't be a bigger matchup to keep an eye on than Vontae Davis and Antonio Brown, who have both been playing like Pro Bowl-caliber players this year.
So far, opponents haven't found a way to slow down Brown, who has caught 50 passes for 719 yards and five touchdowns already. His incredible speed and ability to quickly switch directions has made it a nightmare for opposing cornerbacks to cover him.
Fortunately, Davis might be the one that can contain him. So far, Davis has lived up to his massive new contract, holding opposing quarterbacks to just a 35.2 passer rating when throwing his way, while allowing just 14 receptions for 174 yards all year, according to Pro Football Focus (subscription required).
With two talented players going head-to-head, this will be the most exciting matchup to watch on Sunday.
Dwayne Allen vs. Steelers Linebackers
One of the biggest differences for this year's Colts offense has been Dwayne Allen, who missed all of last season. Not only has he been an effective blocker in the running game, but he's also been a threat in the red zone, catching 21 passes for 305 yards and five touchdowns this year.
Allen has a chance to continue making plays against the Steelers, who have struggled this year defending tight ends. Through seven games, they've allowed 31 receptions for 449 yards and four touchdowns to tight ends, according to ESPN.com.
Luck loves looking for his tight ends down the field, so expect Allen to get some more work in on Sunday.
Erik Walden vs. Marcus Gilbert
Last week wasn't the best for Erik Walden, who was ejected from the game after making contact with an official. Still, this season has been much better for Walden, who needs to shake off the ejection and continue to play at a high level against Marcus Gilbert.
The former second-round pick in 2011 has been enjoying possibly the best season of his career, particularly in the run game. This season, Gilbert is the fifth-highest graded offensive tackle in run blocking, according to PFF's metrics.
Walden's main job is to set the edge and help stop the run, so a good game from him could go a long way in stopping Le'Veon Bell.
Colts' X-Factor of the Week: Donte Moncrief
With Wayne out for Sunday's game, rookie Donte Moncrief will finally have the chance to get some more work after making some promising plays up to this point in the season.
So far, Moncrief has caught just nine passes for 103 yards, but that's mostly because he's the No. 4 receiver on the depth chart. When Hilton went down in Week 3 against the Jaguars, Moncrief stepped up in the second half, catching four passes for 55 yards.
During his time at Ole Miss, Moncrief was consistently a big-play threat, and if the Steelers don't do their homework on the rookie, they could end up getting burned by him this week.
Source : http://bleacherreport.com/articles/2243345-colts-vs-steelers-complete-week-8-preview-for-indianapolis