Team Penske continues his dominance during the third practice session of the Verizon IndyCar Series Grand Prix of St Petersburg. Power, Pagenaud, Castroneves and Montoya finish on top 5. Sato was the first Honda on fourth place.
Simon Pagenaud and Will Power (Team Penske) have dominate the last practice session in Saint Petersburg.
The session had two red flags moments due to the stop of Sébastian Bourdais (KV Racing Technology) first, and Tony Kanaan (Chip Ganassi Racing) then.
Results:
| Pos. | Car | Driver | Team | Lap Time | |
| 1 | 1 | Will Power | Team Penske | 1:1,362 | |
| 2 | 22 | Simon Pagenaud | Team Penske | 1:1,483 | + 0,121 |
| 3 | 3 | Hélio Castroneves | Team Penske | 1:1,509 | + 0,147 |
| 4 | 14 | Takuma Sato | A. J. Foyt Enterprises | 1:1,511 | + 0,149 |
| 5 | 2 | Juan Pablo Montoya | Team Penske | 1:1,544 | + 0,182 |
| 6 | 28 | Ryan Hunter-Reay | Andretti Autosport | 1:1,636 | + 0,274 |
| 7 | 9 | Scott Dixon | Chip Ganassi Racing | 1:1,798 | + 0,436 |
| 8 | 15 | Graham Rahal | Rahal Letterman Lanigan Racing | 1:1,857 | + 0,495 |
| 9 | 11 | Sébastien Bourdais | KV Racing Technology | 1:1,894 | + 0,532 |
| 10 | 83 | Charlie Kimball | Chip Ganassi Racing | 1:1,983 | + 0,621 |
| 11 | 26 | Carlos Muñoz | Andretti Autosport | 1:2,028 | + 0,666 |
| 12 | 10 | Tony Kanaan | Chip Ganassi Racing | 1:2,041 | + 0,679 |
| 13 | 8 | Sage Karam (R) | Chip Ganassi Racing | 1:2,108 | + 0,746 |
| 14 | 4 | Stefano Coletti | KV Racing Technology | 1:2,130 | + 0,768 |
| 15 | 27 | Marco Andretti | Andretti Autosport | 1:2,132 | + 0,770 |
| 16 | 20 | Luca Filippi (R) | CFH Racing | 1:2,144 | + 0,782 |
| 17 | 5 | James Hinchcliffe | Schmidt Peterson Motorsports | 1:2,150 | + 0,788 |
| 18 | 67 | Josef Newgarden | CFH Racing | 1:2,160 | + 0,797 |
| 19 | 7 | James Jakes | Schmidt Peterson Motorsports | 1:2,284 | + 0,922 |
| 20 | 41 | Jack Hawksworth | A. J. Foyt Enterprises | 1:2,301 | + 0,939 |
| 21 | 18 | Carlos Huertas | Dale Coyne Racing | 1:2,391 | + 1,029 |
| 22 | 25 | Simona de Silvestro | Andretti Autosport | 1:2,409 | + 1,047 |
| 23 | 98 | Gabby Chaves (R) | Bryan Herta Autosport | 1:2,622 | + 1,260 |
| 24 | 19 | Francesco Dracone (R) | Dale Coyne Racing | 1:4,871 | + 3,509 |