Leading a double life: Hamlin rising in two series.

Byline: Dave Kallmann

Jun. 21--He's definitely Denny now, not J.J. or Jason.

Perhaps that's the biggest benefit to winning a NASCAR Nextel Cup race for rookie Denny Hamlin; he's no longer confused for a teammate and a predecessor at Joe Gibbs Racing.

But it's not only at the top level of stock-car racing where the 25-year-old Virginian has established his identity.

A full-time double-duty driver, Hamlin is enjoying a breakout second season in the Busch Series, as well. And success in one garage seems to bubble over into the other.

"I do love running that Busch car," Hamlin said, flashing a broad smile. "It's a lot of fun when you're …