Mike Trout (back) is serving as the Angels' designated hitter on Thursday against the Astros. Trout sat out Wednesday because of lingering soreness in the middle of his back. He underwent an MRI, which only showed inflammation. The 22-year-old superstar is batting .293/.379/.546 with 11 homers, 38 RBI, five steals, and 34 runs scored in 54 games this season.