I don't want to hijack the thread since my official sketch cards aren't sports-related, you can see all of my work at the link in my signature.
The only "official" sports artwork I've done is paint a Phanatic statue for the Phillies that raised over $14,000 for their charities. :)
Here are some pieces I've done that I've gotten signed in-person.
Ray Park
Robert Englund
Roddy Piper
Penn & Teller
(Penn signed it on the bottom left, hard to make out)
That 1 Guy
Mick Foley
Jack Nicklaus (I don't own this, someone I drew it for got it signed)
Here's a rundown of the program:
http://philadelphia.phillies.mlb.com/news/...t=.jsp&c_id=phi
And here's the dedicated site to it:
http://philadelphia.phillies.mlb.com/phi/f...around_town.jsp
If you go there and click on the About the Artists button, make sure you check me out on the list -...