Seattle selected Woo's contract from Double-A Arkansas on Saturday.
Woo is set to make his major-league debut in a start Saturday against the Rangers as he skips the Triple-A level. The 23-year-old right-hander had registered a sharp 2.05 ERA, 0.87 WHIP and 59:12 K:BB through 44 innings (nine starts) this season in the Texas League and seems worthy of a try in most fantasy formats. He's replacing Marco Gonzales (forearm) in the Mariners' rotation.