It's an adapted Minolta 80-200 f/2.8 as seen here: http://kenrockwell.com/minolta/maxxum/80-200mm-f28.htm
The flange distance for Konica-Minolta is only 0.5mm longer than EF. No chance of mount adapter for that without losing infinity focus. You could change out the mount itself to EF, but it would still be a manual focus lens with no aperture control (wide-open only). I can't see anyone with a press pass to photograph the World Series doing that.
Another suggestion from a man who knows everything about lenses. He thinks it’s a “28-300 with filter barrel removed”.
So Roger think it's a modified 28-300mm. Any pictures online of such a beast? Any reason given for why one would modify it as such?
Game 2 picture from the gigapan - same guy (hard to tell since his face is obscured, but he's in the same area as Game 1)? If so, he's a Canon shooter, as that is the 200-400mm f/4L.