Walker recorded the final out to earn the save in Monday's win over Cleveland.
Nathaniel Lowe took Andrew Kittredge yard for a three-run jack earlier in the ninth inning, but Walker extinguished the fire to preserve the win for Baltimore. It was the first save of the season for Walker, who has a 2.01 ERA, 1.30 WHIP and 23:8 K:BB with three holds over 22.1 innings. The southpaw doesn't figure to see many more save opportunities down the stretch.