Trey Yesavage and Roki Sasaki are barely babes in the woods when it comes to Major League Baseball experience. Which only makes their postseason success more impressive. Both in the minors last month, Yesavage and Sasaki are suddenly two of the most important pitchers in the World Series as the Toronto Blue Jays take on the defending champion Los Angeles Dodgers beginning Friday night. Neither rookie has turned 24 yet or appeared in more than 17 big league games. Yesavage, however, has two wins as the No. 2 starter in Toronto’s playoff rotation. And after missing 4 1/2 months with a shoulder injury, Sasaki shifted to the bullpen and began closing for the Dodgers.