Mack completes Schmidt IPS lineup.

After testing nearly a dozen different drivers over the course of the winter Sam Schmidt has completed his three-car 2003 Infiniti Pro Series lineup with former karter and NASCAR short-track ace Lloyd Mack, younger brother of IRL driver George.

The 21 year-old will make his Infiniti Pro Series debut in the season opening Miami 100 this weekend alongside Schmidt's other two drivers Tom Wood and other new signing Brandon Erwin.

Mack will drive the No. 6 Sam Schmidt Motorsports Dallara/Infiniti/Firestone entry with backing from On-Line Financial Services and Barstow Orthopaedics and will also be the first African-American driver to compete in the Infiniti Pro Series, the IRL's official development series.

"I'm very excited about it," Mack said of his debut. "My goals are to try to get as many top 10's as possible and try to get in the top 10 in points at the end of the year. There's a lot of competition in the Infiniti Pro Series, and that's one of the main reasons I accepted the offer from Mr. Schmidt to run it.

"I think it's an excellent stepping ground for me to try to eventually get to the IRL (IndyCar Series)."

Mack, who lives in Chino, California won numerous regional karting championships and more than 100 karting victories between 1991-98. He finished second in the 1998 International Karting Federation Grand Nationals. Mack also finished in the top five in each of his five starts in the NASCAR Grand American Modified Series in 2002 and has competed in the NASCAR Super Late Models division.