Little Leaguer
In "Superman's Day of Doom" (Superman No. 157 1962) whilst all his friends from the present and future were celebrating Superman Day in Metropolis (the date of Superman's arrival on Earth), the Man of Steel lay dying from exposure to a chunk of Green Kryptonite - courtesy of an anniversary present from the warped mind of Bizarro Number One.
As the stricken Man of Tomorrow lay helpless, he combed the festivities with his X-Ray Vision to see which one of his friends would save them - prophetically one with the initals L.L as foretold by a gift, "...an advanced kind of computer!" from the Cybern Galaxy.
As his life ebbed away Superman was suddenly saved by a young lad playing baseball who was wearing a uniform. Surprisngly, Superman's rescuer's name didn't have the initals L.L. - Steve Snappin. Then, Superman saw the lettering on the back of his savior Steve's uniform - that he was, in fact, a Little Leaguer.
External Links to Online Comics
"Superman's Day of Doom" from Superman 157 [1]