Book one in the seven book series 'Bergman Brothers' by Chloe Liese.

Ryder
Why she hates me, I don't know. What I do know is that Willa Sutter is the kind of chaos I don't need in my tidy life. Wild hair, wilder eyes. Bee-stung lips that should be illegal. A temper that makes the devil seem friendly. And she's turned our Business Mathematics course into a gladiator arena...

Willa
Rather than give me the lecture notes I missed like every other professor, I have been told to get them from the silent, surly flannel-wearing mountain man sitting next to me in class. Well, I tried. And what did I get from Ryder Bergman? Ignored.
As a female soccer player, I've battled men before. But with Ryder, it's war. And victory is going to taste so, so sweet...