great picture - he's wearing the away uniform so it is not US Cellular Field in Chicago(Cominsky) and since the pads are blue not green, it is not Fenway Park. Anyone know what stadium this could be?
Toronto, maybe? I'm basing that guess on the right field corner in this pic:
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On further investigation, I'm going to go with Yankee Stadium. The guy in stripes seems to have sunglasses on his head, which wouldn't be too necessary in the Skydome.
Right field line at Yankee Stadium:
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Of course, this could be inter-league play, which would allow for the possibility of Turner Field in Atlanta, but I don't think the ChiSox have played in Atlanta, and the line in Turner is further away from the wall than that one in the picture looks to be.
My vote still goes to Yankee Stadium.

. And with the Yanks in town tomorrow, that alone will spawn another couple pages.