Fever Pitch (2005)

When relaxed and charming Ben Wrightman (Jimmy Fallon) meets workaholic Lindsey Meeks (Drew Barrymore) she finds him sweet and charming, they hit it off and when it is winter Ben can spend every waking hour with Lindsey, but when summer comes around the corner Lindsey discovers Ben's obsession with the Boston Red Sox. She thinks it is perfect until everything goes downhill for them, based on Nick Hornby's novel "Fever Pitch"