Casilla, the A’s closer, inherited a two-run lead in the ninth and promptly turned it right over, failing to get an out in Toronto’s 3-2 victory Wednesday at Rogers Center. Casilla walked Josh Donaldson to open the ninth, Justin Smoak clobbered a two-run homer to right, and Kendrys Morales followed by doing the same. Over his first five big-league outings, Blackburn, 23, has allowed a total of eight earned runs in 32 innings, a 2.25 ERA. Opponents are 1 for 19 with runners in scoring position against him, including