Mack's first year with the Bears couldn't have gone any better. He racked up 12.5 sacks, six forced fumbles and four passes defended, leading the Bears to a 12-4 record and the NFC North division title.
Last year, Mack didn't even place in the top 10 for jersey sales, whereas Brady came in at second behind only Carson Wentz. Given his major impact on a big market Chicago team, Mack's popularity across the football world soared big-time.
The Oakland Raiders refused to pay Mack heading into this season, so head coach Jon Gruden opted to trade him to Chicago in exchange for four draft picks (including two firsts). The blockbuster deal paid major dividends for the Bears, who punched their first ticket to the postseason in eight years.
Brady, meanwhile, had another Pro Bowl season and led the Patriots to an 11-5 record and their 10th straight AFC East division title. It's safe to say that as long as he keeps playing, Brady jersey sales will remain in the top five.
Meanwhile, Patrick Mahomes placed third on the list after one of the most dominant seasons in NFL history. The 23-year-old tossed 50 touchdown passes - tied for second-most ever in a season. He also had 5,097 yards and led the Kansas City Chiefs to the top seed in the AFC with a 12-4 record.
The other players to round out the top 10 aren't the least bit stunning. The likes of Baker Mayfield and Dak Prescott emerged as some of the game's top young quarterbacks of 2018. Fans love the new guys. What else can we say?
What This Means
Khalil Mack's popularity is only going to grow even more, as the Bears continue to form into a Super Bowl caliber team. He's arguably the league's best defensive players on one of the league's most popular teams. Don't be surprised if he ends up being No. 1 in jersey sales next year.