First game of the season and Braun is already down with an oblique strain. He had the same injury last season, in addition to his thumb and ankle injuries.
Whoever his trainer is should be fired, since this is probably related to Braun not swinging a bat most of the offseason due to recovering from thumb surgery. As most of us who play adult leagues/over the line/hit in the batting cages, the first muscle to get weak/tired/sore when swinging close to full intensity is the oblique. His trainer should have had him conditioned and ready to go.