Sometimes the NFL's top plays on a Sunday come from people we wouldn't expect. They're the plays that make you ask, "Who was that?" These performances can change a player's career.
Here's a look at Week 15's unheralded ballers, starting with a Patriots backup cornerback who got a hand on a game-deciding pass and a pair of young Jaguars undrafted receivers with monster days:
What happened: Rowe trusted his instincts on Roethlisberger's fake spike, keying on his receiver who was running a slant, and he broke on the ball. He got a hand on it and it landed in Harmon's hands for the game-sealing interception.
Why it matters: It was the play of the game during the game of the season. Rowe, who had been upgraded to the No. 3 cornerback, could be a prime reason why the AFC has to go through New England in the playoffs.
Keelan Cole and Jaydon Mickens, WRs, Jacksonville Jaguars
Cole: 7 catches for 186 yards, TD; Mickens: 4 catches for 61 yards, 2 TDs in 45-7 win against Texans
What happened: Cole's highlight play was a 73-yard reception he didn't even score on as he exploded onto the scene. Mickens has made weekly splashes as a punt returner, but he had just one catch before scoring two touchdowns against Houston.
Why it matters: This is the second consecutive week that a pair of Jaguars receivers have made the unheralded ballers team. It's the second appearance for both players, too. Unlikely production from unlikely sources has the Jaguars playoff-bound for the first time since 2007.
Sack, three tackles for loss, three quarterback hits in 27-10 win against Browns
What happened: Judon was all over the field racking up six tackles (three for loss), a sack and three quarterback hits as the Ravens defense had its way against the Browns.
Why it matters: The Ravens are in prime position to make the playoffs if they win out. Dominating defensive efforts like Judon's on Sunday will help secure the berth.
Sack/fumble, three pass deflections in 20-15 win against Cardinals
What happened: Lanier took down Blaine Gabbert for a strip sack that led to Washington's first touchdown. He was a menace, disrupting Gabbert with his length and pass rush.
Why it matters: Washington's players are playing to put up good game tape. The athletic, developing Lanier played his most impactful game Sunday.
Two TDs, 70 yards in 34-29 loss to Eagles
Why it matters: King, a fifth-year pro, came into this game with just one career regular season touchdown. It's never too late for a career game and to become an unheralded baller.
Electric 53-yard punt return in 42-7 win against Seahawks
What happened: Cooper returned seven punts for 128 yards, but the highlight was a 53-yarder when he split several defenders and almost made it to the end zone.
Why it matters: Cooper is the NFL's leading kick returner and among the top punt returners. He provides a special-teams jolt for a Rams team that already has plenty of offense.
ESPN NFL Nation reporters Mike Reiss, Mike DiRocco, Jamison Hensley, John Keim, Jordan Ranaan and Alden Gonzalez contributed to this story