Saucedo earned the save in Tuesday's 4-3 win over the Athletics after coming in to get the final out of the game. He did walk a batter before ending things.
Saucedo (2-0) got the win against the Astros on Tuesday, firing a scoreless eighth inning during which he issued a walk and recorded a strikeout.
The Mariners reinstated Saucedo (knee) from the 15-day injured list Sunday.
Saucedo (knee) struck out one over a scoreless inning Thursday in his first rehab appearance with Triple-A Tacoma.
Saucedo (knee) underwent an MRI on Friday which yielded "overall positive" results, Daniel Kramer of MLB.com reports.
The Mariners placed Saucedo on the 15-day injured list Wednesday with a hyperextended right knee.
Saucedo got the save Tuesday in a 3-1 win over the Reds after retiring the only batter he faced in the ninth.
Saucedo (1-0) was credited with the win in the extra-inning victory over the Red Sox on Saturday, allowing a hit and issuing an intentional walk over one-third of a scoreless inning.
Saucedo has not allowed a run through five innings across five Cactus League appearances while surrendering four hits, hitting a batter and posting a 6:0 K:BB.
Saucedo recorded his first save in an extra-inning win over the Royals on Tuesday, firing a perfect 10th inning during which he didn't record a strikeout or issue a walk.