Broncos vs. Cowboys: Five Key Matchups
Take a look at some of the most important matchups for Sunday's game in Dallas.
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
Quarterback Peyton Manning is off to an unprecedented start to the season. He's thrown for 16 touchdowns, zero interceptions and the Broncos have only allowed five sacks. The Cowboys are third in the NFL in sacks and will be looking for more against the Broncos.

Chris Clark has done a solid job at left tackle for the Broncos though he's only had two starts at the position. DE DeMarcus Ware already has five hurries and five tackles for loss this season and could prove to be a challenge for Clark.

Dez Bryant is the Cowboys' leading receiver with 23 catches for 282 yards and four touchdowns. Dominique Rodgers-Cromartie has seen some success so far this season in shutting down talented wide receivers. Last week, DeSean Jackson caught just two of six passes thrown his way for 34 yards.

DeMarco Murray has rushed for 356 yards this season on 72 carries and the Cowboys average 102.3 rushing yards per game. But the Broncos have the best run defense in the league thanks in part to the push provided by the interior of the defensive line.

Wes Welker, Demaryius Thomas and Eric Decker have combined for 999 yards and 11 touchdowns in the first four games of the season. The Cowboys have picked off four passes this year and have registered 19 passes defensed.