Kanaan and Andretti Green Racing swept a day and a half of testing March 3-4. The second set of drivers are testing March 5-6.
Briscoe's best lap, 52.7757 seconds, 113.916 mph, was faster than Kanaan's best lap from March 4 by 0.0852 of a second.
"The track seemed to clean up really quickly during the afternoon and the rubber that the guys laid down the last couple of days is still there," Briscoe said. "It's just a bit tough here sometimes, because you're chasing the track conditions. Overall, we're really happy with the work we got done today on the Team Penske car. We did a lot of setup work, just trying to build a database of tools we can work with when we go to St. Petersburg."
Castroneves best lap was 113.465 mph. Dan Wheldon, Scott Dixon, Buddy Rice, Darren Manning, Vitor Meira and Milka Duno rounded out the time sheet.
The final day of testing is scheduled for 9 a.m.-5 p.m. March 6.