Closer Jim Johnson got the last out with the bases loaded in the ninth, for his fifth save of the season and converted his 13th straight save opportunity.
Johnson issued a leadoff walk to Alex Rios, who moved to second on a sacrifice bunt. Rios moved to third on a fielding error by Hardy at short, but pinch hitter Kosuke Fukudome lined his first offering to Wilson Betemit at third for the second out, but then walked De Aza to load the bases.
Brent Morel then ended the game with a short chopping ground out to third to end the game.
"They did a great job,” Chen said of the Orioles bullpen. “It's beautiful, it's nice. The men behind me support me a lot and I appreciate it."
Reimold also made two key defensive plays, a diving catch on Morel’s liner to shallow left-center in the first and a running grab of Gordon Beckham’s shot deep into the gap in the seventh.
"Nolan's always been a good defender,” Showalter said. “He can track a ball and really make up some ground that a lot of people can't once he gets underway. He and (first-base coach Wayne) Kirby have worked hard on his breaks and some stuff that he does and it's really good to see him get a return for it tonight because that was a big difference for us."