The Blue Jays are buying high on J.A. Happ, coming off a 3.3 WAR season in 2015 that saw him emerge as one of baseball’s best pitchers following a July 31st trade from the Seattle Mariners to the Pittsburgh Pirates. Toronto is betting on the latter half of Happ’s season being more than good fortune, and a closer look at his 2015 August and September indicate that his success was the product of improved mechanics and a more aggressive pitch selection.
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Happ was mediocre at best with the Mariners after arriving in the Michael Saunders deal, putting up a 4.