Sakura might be physically stronger - note the might be - but A has the speed advantage. When Sasuke dodged Bee's attack, he commented that only his brother (and now Sasuke) was able to dodge it. So, given team 7's progress, Sakura is too slow, way too slow like Tsunade. Strength isn't everything in battle, a lot of things matter; intelligence, tactical ability, enemy moves knowledge, breaking them down, speed, battle experience etc etc. Both of them are stupid as far as intelligence and enemy move deciphering goes. Stupid as rocks.
BUT, A has a huge advantage in terms of speed, experience, and jutsus. A takes this easily.