TORONTO — The Seattle Mariners are built around starting pitching, with depth that gives them strong choices no matter who they pick. On Monday, they announced their starters for Games 3 and 4 of this American League Championship Series in Seattle — with yet another quality arm on the way.

George Kirby will start Game 3 on Wednesday at T-Mobile Park, followed by Luis Castillo in Game 4. And Bryan Woo, the All-Star righty who is on the ALCS roster but has been out since Sept. 19 with pectoral inflammation, threw off the mound here before batting practice Monday.

“Having Bryan back is going to be awesome,” Kirby said. “He’s been feeling good.”

However (and whenever) the Mariners deploy Woo, he presumably would add another high-impact arm to a staff that has a 2.95 ERA in its first six pos

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