ASHEBORO — When something notable happens for the Asheboro Copperheads, there’s a good chance it could have something to do with one of their players from UNC Greensboro. The time this summer with the Coastal Plain League team has been an ideal proving grounds for the college players. “It’s top-level competition, really good,” said infielder Matt Kemp, who’s from Randleman. “It’s better than I thought it would be.” While Kemp is getting back in the swing of things after his freshman season, pitcher Jared Mathewson is trying to tune up for a final go-around at the college level.  “It has…