The Double-A Harrisburg Senators announced that catcher Derek Norris has been activated from the seven-day disabled list and has returned to the roster. The Senators roster now stands at 24 active and one on the disabled list. Catcher Brian Peacock has been returned to the Single-A Potomac Nationals. Jeremy Mayo heads back to the Gulf Coast League. A Nationals source reports Norris is "ready to go." Weather permitting, Norris is expected to start tonight. Norris injured his ankle running down the line to first on a grounder last Monday night. He has played in three games with six at-bats.