Packers running back Eddie Lacy has played five games against the Vikings and 43 against the rest of the NFL.
Against the rest of the NFL, the powerful runner is averaging a relatively tame 64.2 yards rushing per game. Against the Vikings, his average is 106.8 per game.
"I don't know if he runs harder against us or what it is," Vikings cornerback Captain Munnerlyn said. "I don't know if he's got something against the Minnesota Vikings or what. But he definitely runs hard. When we play him, he definitely has a chip on his shoulder."
The Vikings and Packers meet on Sunday night in Green Bay.
Lacy averages half a yard more per carry against the Vikings (4.7) than he does against the rest of the league (4.2). He also has 11 100-yard games, four of which have come against the Vikings. After opening with 94 yards in his first game against the Vikings as a rookie in 2013, Lacy has posted games of 110, 105, 125 and 100. Five of his 23 career rushing touchdowns are against the Vikings.
Typically, when the Vikings struggle defensively under coach Mike Zimmer, the initial breakdown comes early on against the run. Lacy has tested Zimmer's defense, running for 330 yards and four touchdowns on 60 carries (5.5) in three meetings, all Green Bay victories.
"First of all, their offensive line does a good job of blocking, especially run blocking," Zimmer said. "They are very flat with a lot of their blocks. They try to get you out of position and when they get you, they don't allow you to get off of blocks. And then he's obviously a good back."
Packers coach Mike McCarthy said he has no idea why Lacy's numbers jump against the Vikings.