A pivotal matchup in the wide-open NFC East takes place on Sunday Night Football at 8:20 p.m. ET when the Dallas Cowboys take on the Philadelphia Eagles at Lincoln Financial Field. The defending Super Bowl champion Eagles (4-4) could tie for first place in the division with a win on Sunday combined with a loss by the Redskins. Meanwhile, the Cowboys (3-5) are looking to snap a two-game losing streak and could move within a game of the division lead with an upset of Philadelphia. The Eagles are 7.5-point favorites and the over-under for total points scored is 44 in the latest Cowboys vs. Eagles odds. Before you make any Cowboys vs. Eagles picks, you need to hear what SportsLine's Mike Tierney has to say. 

Tierney is a widely respected national sportswriter who also has emerged as one of the top handicappers in all sports for SportsLine. He's currently their top NFL analyst for the 2018 season, posting an astounding 37-14 record, returning $100 bettors a profit of more than $2,100. Tierney has been similarly proficient in handicapping these NFC East rivals, amassing an incredible record of 22-8 on against the spread picks involving the Cowboys or Eagles over the past two seasons.

Two weeks ago, Tierney advised SportsLine members that the Eagles (-3) would have the edge against the Jaguars in their neutral-site meeting in London. The result: Philadelphia managed a 24-18 win, and anyone who followed Tierney's advice pocketed another winner. 

Now, he has scrutinized Cowboys vs. Eagles from every possible angle to reveal a strong point-spread pick that he's only sharing at SportsLine. 

Tierney knows the Eagles have been hampered by injuries and inconsistent play, but are coming off a bye following one of their most complete performances of the season. 

In their win over Jacksonville, quarterback Carson Wentz threw for 286 yards with three touchdowns and one interception. Wentz hit tight end Zach Ertz with what proved to be the game-sealing score with 9:55 left. The Eagles finished with 395 yards of total offense, their third-highest output this season. 

The defense also stepped up when it mattered most. The Eagles held Jacksonville to two fourth-quarter field goals and halted the Jaguars' final drive with a fourth-down stop. The Jaguars gained just 60 rushing yards. 

But this dominant performance doesn't ensure the Eagles will cover against a reeling Cowboys club that should play with a sense of urgency in an effort to salvage its season. 

The Cowboys' 28-14 loss last Monday night to the Titans was marked by missed opportunities. Still, Dallas had its share of bright spots. Newly-signed wide receiver Amari Cooper had 58 receiving yards and a touchdown in his Cowboys debut, while Dak Prescott threw for 243 yards with two touchdowns. Cooper now has had another week to digest the Cowboys' playbook.

The Cowboys have covered in five of their past six trips to Philadelphia, and the road team is on a 10-3 run against the spread in this series.

We can tell you Tierney is leaning toward the Under, but his much stronger play is on the side. He has identified a crucial X-factor that makes one side of the spread a must-back. It's only available at SportsLine. 

Who covers Cowboys vs. Eagles? And what crucial X-factor makes one side of the spread hit hard? Visit SportsLine now to see which side you need to jump on Sunday night, all from the top NFL expert who's 22-8 on spread picks involving these teams.