"Ninety percent of the game is half mental."

Happy birthday to Yogi Berra, born on this day in 1925. 10-time World Series champion and king of the quotable quip — even if he didn't say most of what he said. This July 11, 1955 issue of Sports Illustrated was his first appearance on the cover Of the 32 newsstand issues slabbed by CGC, 18 are graded higher than this 7.5.