The problem with most of the shots I took at the basebal game was underexposure. Given the tricky lighting of a night game, plus the fast shutter speed necessary to capture sports action as well as combat camera shake when using a large zoom lens, I was forced to use a pretty wide-open aperture. Which was fine, because I wanted a shallow depth-of-field, usually. This led to many shots having a blurry subject due to bad focusing on my part, but also underexposure of the whole scene. I knew this was happening, and figured I could "fix it in post" ... the problem is that I didn't think until too late that I had another variable I could factor into the mix -- the ISO setting of the digital "film" ... I kept it at the lowest my camera would go (200) rather than bumping it up.
Blah, blah, blah ... so what that means is that I need to take longer to post my shots as I figure out a way to bump up the lighting levels in Photoshop.
That doesn't mean I didn't still get some decent shots, like this one of a vendor pushing his wares: