Love/hate relationships in baseball.
 

Yeah, I know. Steinbrenner and Martin. It was even mentioned in Buck Herzog's bio on SABR. Herzog and John McGraw hated each other, but McGraw always wanted Herzog on his team. Here is the link to Herzog's bio:

http://sabr.org/bioproj/person/4d0cbe1b

If you have other love/hate relationships before WWII, feel free to post them with cards, if you have them.

Cobb/Crawford
 

It was believed Cobb and Crawford had an icy relationship during their playing days, but Cobb was known to have later stumped for Crawford's induction into the HoF. If I had a Boss Schmidt card, I would have posted that given he pummeled Cobb a couple times.