Notre Dame seems to pretty often have multi-sports stars who could've gone pro in numerous sports. Golden Tate, Jeff Samardzija, Connaughton, Torii Hunter Jr., Tom Zbikowski, etc. Pretty impressive.
As for the thread, I'd pick a guy like Connaughton, who could've gone pro in baseball but chose basketball. I'm not sure I can think of any others at the moment. All the names I'm thinking of are long retired, Charlie Ward, Danny Ainge, etc.