I've been demo'ing the Pure Drive Cortex (non-Roddick version) for the past few days. Initially I liked the feel of the big sweet spot and the power/spin it provided. Not much effort needed to produce powerful shots with this racquet for sure. However after 2 days of hitting, my elbow started to hurt... I was wondering if this has happened to other people as well. I know it's a light racquet, but I've tried similar lightweight racquets in the past and non gave me the TB. Could it be the Cortex System that's causing it?