The Orioles claimed Rivera off waivers from the Marlins on Wednesday.
Rivera is out of options, so he will report to the major-league club. Once that happens, the Orioles will need to make a corresponding move to their 26-man roster. Rivera slashed only just .214/.294/.269 with one home run in 96 games with the Marlins, but he grades out well defensively at third base, where he could get some reps while the Orioles try to withstand the loss of Jordan Westburg (hand).