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Seattle’s freshly extended ace could be the division’s most valuable starter.

When was the last time the Seattle Mariners had the ace of the AL West?

While Félix Hernández’s heyday is hardly ancient history, the cream of the crop has been reserved for pitchers among the league’s best. In Houston, Justin Verlander, Gerrit Cole, and Zack Greinke. In Texas, Lance Lynn, Mike Minor, and Cole Hamels. In Oakland, Frankie Montas,...

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