Taijuan Walker was lit up for nine runs and nine hits in 3 1/3 innings by the A's on Friday.
Taijuan Walker gave up one run in two innings of work in his final spring tune-up against the Rockies on Saturday.
Taijuan Walker was again terrific, limiting the Angels to one run in seven innings as the Mariners won 5-3 on Monday.
Taijuan Walker has won the fifth spot in the Mariners' rotation.
Taijuan Walker is next scheduled to start on Monday, while Roenis Elias is not currently penciled in for any more Cactus League starts.
Taijuan Walker twirled six scoreless innings Wednesday night against the Cubs.
Taijuan Walker recorded five strikeouts while tossing four shutout innings in Thursday's Cactus League game versus the Indians.
Taijuan Walker threw three hitless innings Saturday as the Mariners topped the Diamondbacks in Cactus League play.
Taijuan Walker began his spring with a pair of scoreless innings on Wednesday against the Padres.
Taijuan Walker will compete with Roenis Elias and Erasmo Ramirez for the fifth spot in the Mariners' rotation.
Mariners general manager Jack Zduriencik said in an interview on MLB Network Radio on Sunday that he isn't motivated to trade any of his starting pitching.
Mariners general manager Jack Zduriencik confirmed Sunday that Taijuan Walker has left Surprise in the Arizona Fall League to return to his home in California.
Taijuan Walker will pitch 30 innings in the Arizona Fall League.
Taijuan Walker tossed an eight-inning complete game, allowing only one run, but suffered the loss on Wednesday against the Blue Jays.