Power stays on top in practice three

The extremely competitive hour saw countless changes of lead, but in the end it was established road and street course master Power who emerged on top once again.

Mike Conway maintained his excellent form for Andretti Autosport to take second - meaning the British returnee has been in the top three in all three sessions this weekend. He was 0.3 seconds slower than Power, and just ahead of the Australian's Penske team-mates Helio Castroneves and Ryan Briscoe.

Fresh from announcing a sponsorship deal that cements his comeback with Newman/Haas, Oriol Servia took a strong fifth place.

Ganassi had two cars in the top 10 with Scott Dixon sixth and Graham Rahal eighth, but its champion driver Dario Franchitti was classified slowest after an early crash.

He certainly was not the only driver making an error in the fraught session - Simona de Silvestro, Danica Patrick, Conway, Power, Dixon, Tony Kanaan, Sebastian Saavedra, Charlie Kimball and EJ Viso all had excursions too.

Most were harmless, but Viso gave KV Racing Technology yet another rebuild to complete after a late crash that damaged three corners of the car. The Venezuelan has now had an accident in every session this weekend.

More encouragingly for KV, Tony Kanaan took seventh and Takuma Sato 10th in the team's other two cars. Justin Wilson was ninth for Dreyer & Reinbold.

Further back, Saavedra continued to show good form in his first street course IndyCar event, putting the Conquest in 11th, with Raphael Matos also showing well for newcomer AFS Racing in 13th.

Pos  Driver               Team               Time        Gap
 1.  Will Power           Penske             1m02.7167s
 2.  Mike Conway          Andretti           1m03.0607s  + 0.3440s
 3.  Helio Castroneves    Penske             1m03.1659s  + 0.4492s
 4.  Ryan Briscoe         Penske             1m03.1891s  + 0.4724s
 5.  Oriol Servia         Newman/Haas        1m03.2987s  + 0.5820s
 6.  Scott Dixon          Ganassi            1m03.3204s  + 0.6037s
 7.  Tony Kanaan          KV                 1m03.3988s  + 0.6821s
 8.  Graham Rahal         Ganassi            1m03.5578s  + 0.8411s
 9.  Justin Wilson        Dreyer & Reinbold  1m03.5842s  + 0.8675s
10.  Takuma Sato          KV                 1m03.5953s  + 0.8786s
11.  Sebastian Saavedra   Conquest           1m03.6575s  + 0.9408s
12.  Alex Tagliani        Schmidt            1m03.6710s  + 0.9543s
13.  Raphael Matos        AFS                1m03.6731s  + 0.9564s
14.  Ryan Hunter-Reay     Andretti           1m03.6903s  + 0.9736s
15.  Marco Andretti       Andretti           1m03.7525s  + 1.0358s
16.  Vitor Meira          Foyt               1m03.7761s  + 1.0594s
17.  Danica Patrick       Andretti           1m03.8731s  + 1.1564s
18.  EJ Viso              KV                 1m04.0412s  + 1.3245s
19.  Charlie Kimball      Ganassi            1m04.0837s  + 1.3670s
20.  JR Hildebrand        Panther            1m04.2124s  + 1.4957s
21.  Simona de Silvestro  HVM                1m04.2978s  + 1.5811s
22.  Sebastien Bourdais   Coyne              1m04.3021s  + 1.5854s
23.  James Jakes          Coyne              1m04.3616s  + 1.6449s
24.  Ana Beatriz          Dreyer & Reinbold  1m04.4882s  + 1.7715s
25.  Dario Franchitti     Ganassi            1m05.0195s  + 2.3028s