Ken is a professor at the university. He uses his friendly nature to win against/over students.
Our team won against/over the guest team at the last game.
Do both against and over work in the above wording? If not, why not? Thanks.
In the first case (about Ken), "win over" is a phrasal verb; he gets them on his side (as opposed to being hostile, which they were before he "turned on the charm").
In the second case (the team), both are possible (at least, in Br Eng) but "win against" is much more common.
As to your last question, I don't think it's really fair- that's just the way collocation works.
b
Thanks, Bob.
Roger!