Armstrong signed a minor-league contract with the Marlins on Sunday that includes an invite to major-league spring training, Craig Mish of SportsGrid.com reports.
Armstrong made 31 relief appearances for the Rays and Orioles last year and posted a 6.75 ERA and 1.50 WHIP in 36 innings. The right-hander will compete for a spot in the Marlins' bullpen ahead of Opening Day in 2022.