Roger Penske could be in a line for a record 15th pole in the Indy 500 after the final day of practice prior to qualifying saw Ryan Briscoe head team-mate Helio Castroneves at the top of the times.

Briscoe was fastest with a lap at 39.8263 seconds, 225.981 mph, while Castroneves was second with a lap at 225.438 mph.

Briscoe also earned $10,000 from F.E. Harding Asphalt Companies for the fastest lap on Fast Friday.

"It's hard to tell on the test days, because there's lot of traffic on the circuit," Briscoe said. "We just have to wait until qualifying when you are the only car on the track. I'm feeling good, though. I think the car is running very solid. We've done some non-drafting laps, and the car's been fast. Tomorrow is another day, and everyone is going to be going for it. Hopefully, there won't be any surprises and we can stay at the top."

The past two race winners, Target Chip Ganassi Racing pair Dario Franchitti and Scott Dixon, were third and fourth, respectively, while Andretti Green Racing's Danica Patrick was fifth.

"I would be surprised if one of the Penske's wasn't on the pole," she said. "They seem to really be quick right now. But anything can happen around here. You can be one small change or two or three small changes away from having a really great car or a really bad car or at least a car that's not in the ballpark for the front spot. Anything can happen."

Behind Patrick, Marco Andretti was sixth ahead of Will Power and Dan Wheldon, with the top ten completed by Hideki Mutoh and Alex Lloyd.

The only two incidents of the day saw both Robert Doornbos and Scott Sharp go into the walls. Doornbos managed just twelve laps before making contact with the barrier in turn two although he returned to the track later in the day at the wheel of his back-up car.

"Going into turn one, I felt something really light on the front of the car, and then I brushed the wall," he said. "Then I went into the turn two wall. Hopefully, it was just driver error and nothing went wrong on the car and we are able to fix it and come back strong tomorrow."

Sharp meanwhile managed 25 laps before he spun exiting turn one and slid into the barrier at turn two.

"We were on a sticker run," he said. "It was the second lap, pretty easy. I rolled down in there, and it just snapped on me. I'm not exactly sure what's up."

The top eleven positions in the 33-car starting field will be determined Saturday. The pole winner has gone on to win two of the last three 500s. Positions 12-22 will be filled Sunday. The remainder of the field will be filled May 16, and Bump Day is scheduled for May 17.