The Orioles are placing second baseman Brian Roberts on the 15-day disabled list with a right groin strain, manager Buck Showalter said before Tuesday's game against the Mariners. Roberts was out of the lineup Monday with groin soreness and the Orioles were awaiting results of an MRI up until 90 minutes before game time Tuesday. Since early Tuesday afternoon, Showalter had two lineups written out. Roberts, who missed nearly 13 months recovering from multiple concussions, played just 17 games before landing on the DL again. He is hitting .182 with two runs, zero homers and five RBIs.