Rahal Letterman Lanigan Racing's Graham Rahal claimed the top spot on the timesheet for Sunday afternoon's warm-up session, the last opportunity for the Verizon IndyCar Series teams and drivers to fine tune their cars ahead of this afternoon's Firestone Grand Prix of St Petersburg.

Rahal set a time of 105.426mph (1:01.4648s) on the 1.8-mile, 14-turn temporary street circuit to go top my more than a quarter of a second ahead of KV Racing Technology's Sebastien Bourdais and CFH Racing's Josef Newgarden.

Full Sunday warm-up times from St Petersburg

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It's the first time all weekend that Will Power has been knocked off the top all weekend. The defending series champion was fourth fastest in the warm-up, just ahead of Andretti Autosport's Simona de Silvestro and Power's own Penske team mate Juan Pablo Montoya.

In fact it's the first time that a Honda-powered car has been able to crack the top three in practice at St Petersburg, in what has been largely a Chevrolet show from the outset thanks not only to the company's engine but also the new bespoke aerodynamic components which are being used for the first time in race conditions this weekend.

Power's pole time with the new aero kits was over a second faster than last year's old position time set by AJ Foyt Racing's Takuma Sato.

The Australian will not only start from pole position, he will also be at the head of a Penske four-way sweep of the starting grid. The team's newest signing Simon Pagenaud will start today's race alongside Power, while Helio Castroneves will head up the second row alongside Montoya.

Sato is highest-placed non-Penske and non_Chevrolet car on the grid in fifth alongside Bourdais. Sato was 14th fastest in Sunday's warm-up, seven tenths slower than Rahal.

The 30-minute session was interrupted by two red flags, the first for debris in turn 2 after Newgarden made contact with the rear of de Silvestro's car. Newgarden needed a front wing after the incident, and de Silvestro needed to have repairs to the rear wing of the #25.

A subsequent red flag was also needed when Sage Karam went into the run-off at turn 10 and needed to be retrieved. Karam - making his road/street course d?but in the IndyCar Series this weekend for Chip Ganassi Racing - was 19th fastest in the warm-up, which got underway a few minutes later than its scheduled noon start.

Unlike Friday, the weather today isn't threatening to be a factor in the 110-lap race which is the first of 16 races in this year's open wheel championship.

Full Sunday warm-up times from St Petersburg