"That's good," Manuel said. "I didn't think he could keep a secret."
It will be the third consecutive Opening Day start for Myers. The Phillies had tabbed left-hander Cole Hamels to start Sunday, but he had to be pushed back because he missed time in March with inflammation in his left elbow.
Myers allowed three hits and one run in four innings against the Jays on Tuesday. He struck out three en route to finishing the spring with a 3.52 ERA.
"The way he's pitched here, he was the logical choice," Manuel said.
Left-hander Jamie Moyer will start Tuesday against the Braves. Right-hander Joe Blanton will pitch April 8. Hamels, who will make an exhibition start Saturday against the Tampa Bay Rays at Citizens Bank Park, is scheduled to pitch April 10 against the Rockies in Denver. Myers would then be slated to pitch the 11th, and right-hander Chan Ho Park would toe the rubber on the 12th.
Todd Zolecki is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.