So, with highschool tennis season starting soon, I am in the market for a new pair of sneakers. I have been wearing 2k10's for the last year and they are pretty good. I like that I can do all sports with them, and they offer a decent low to ground feel. Here is the problem, After taking off of tennis for 2 months due to surgery, my big toes blister every time that I play. Why? I'm not sure. Are the shoes too small, or too big? Here is problem #2. My feet are two different sizes. My left foot measures 11, and my right around 10.25. I recently tried on the gel resolutions 4, and while they felt great on my left foot, they felt way too big on my right. HELP ME!!