Tony Allen key to tightening Grizzlies D

Memphis' defensive specialist deserves a lot of credit so far (PER Diem: April 27, 2011)

Updated: April 27, 2011, 2:37 PM ET
By John Hollinger |
Tony AllenJoe Murphy/NBAE/Getty ImagesTony Allen has been a difference-maker for the Grizzlies ever since he became a part of the rotation.