Re: Baseball-related characters in comics/games?
The Fastball killed by OMAC was part of a lame villain team called the Cadre. According to Who's Who in the DC Universe, he was "a former minor league baseball player , then syndicate assassin, whose exoskeleton armor and power gloves give him the ability to throw high-velocity metal spheres of great explosive power." He later got a flying "home plate" that worked kind of like the Green Goblin's glider. The Cadre is pictured at the URL below under the entry for Black Mass. Fastball is the chump in yellow.
http://www.moviepoopshoot.com/comics101/136.html
Kevin Matchstick from Mage carries Excalibur in the form of a baseball bat.
http://scoop.diamondgalleries.com/news_images/845_1660_3.jpg
Casey Jones from Teenage Mutant Ninja Turtles likes to hit people with baseball bats, hockey sticks, etc.
http://www.derok.net/derok/tmntbios2.html
Boomerang was kicked out of the majors for "taking bribes," presumably for throwing games in which he played.
http://www.marvel.com/universe/Boomerang
This list of sports supers includes a baseball section:
http://www.geocities.com/Area51/Dungeon/2864/Super_Sport.html