Shelby Blackstock, Team Starstruck, No. 28

This weekend's Circuit of the Americas event will mark Blackstock's debut in the Pro Mazda Championship after competing in the 2012 USF2000 Championship with Andretti Autosport. Blackstock successfully completed the Pro Mazda test session at the 3.427-mile road course last week.

"I am very excited to be getting back into the swing of things and starting off the 2013 Pro Mazda season at COTA. From the past week of testing it is a absolute blast to drive and a spectacular venue. It should bring very exciting and competitive racing."

Matthew Brabham, Team Andretti Autosport, No. 83

Brabham, the 2012 USF2000 Championship title holder, will compete this weekend for the first time with Indianapolis-based Andretti Autosport, after being announced to the team in December. He led last week's test session in Austin behind the wheel of his No. 83 machine.

"I have been really looking forward to my first race with the Andretti Autosport team. Especially as it's on the new COTA track. Testing last weekend went well and I really enjoyed the driving the track. The team and I are working hard and everything is going to plan so far. So I don't see why we can't carry this momentum into the upcoming race this weekend and go for the win. It exciting to finally get back into race mode and get this season underway."