Luca Filippi went to the top of the timesheets in a shortened final practice session at Detroit Belle Isle on Saturday morning, which saw time lost to a red flag stoppage after Sebastien Bourdais embedded the nose of his car into the tyre barriers.

"It doesn't count now, but it's a way to say sorry to my guys to not getting the position we deserved," said Filippi. "It's a long race and we have to race smart."

CLICK: Full practice 2 times from the Chevrolet Dual in Detroit.

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Bourdais locked up and went off at turn 3 with ten minutes remaining in the 30-minute warm-up session. The French driver, who will start today's race from sixth place on the grid, was able to climb out of the car without assistance, but there was significant damage to the left front of the #11 car that will have the KVSH Racing team scrambling to effect repairs before the start of the first race of the Chevrolet Dual in Detroit doubleheader.

When the session was red flagged, AJ Foyt's Jack Hawksworth was at the top of the timing screens with a lap of 1:16.9737s (109.908mph) which put him 0.3610s ahead of his team mate Takuma Sato, with Rahal Letterman Lanigan Racing's Graham Rahal making up the remainder of an unusual all-Honda top three.

That state of affairs didn't last however, and once the debris from Bourdais' accident was cleared up and the #11 towed away back to the garage area, there was enough time for a number of faster laps before the chequered flag.

CFH Racing's GP2 graduate driver Luca Filippi ended up fastest of all with a best time of 1:16.7466s (110.233mph), just 0.0018s faster than Penske's Helio Castroneves. Ganassi's Tony Kanaan bounced back from his unfortunately timed spin in qualifying to post the third best time of the day, but the Brazilian will nonetheless still have to start from 15th place when this afternoon's 70-lap race gets underway on the 2.35-mile, 14-turn temporary street course.

Penske pair Juan Pablo Montoya and Simon Pagenaud also improved their laps in the final seconds, pushing Hawksworth down to sixth place where he remained the top-rated of all the Honda contingent. The English driver finished the session 0.1497s ahead of the fourth Penske car driven by Will Power, who was taking the session relatively easily after securing his 39th Verizon IndyCar Series pole position on Friday.

Filippi's team mate Josef Newgarden was back in action after the CFH Racing team completed overnight repairs to the back end of the #67 car, which was damaged when Newgarden spun in the first round of qualifying and made backward contact with the wall at turn 13.

The first race of the Detroit doubleheader weekend is scheduled to start on Saturday afternoon at 3.50pm ET (8.50pm BST). Of the top 15 cars on the starting grid, all but one will be starting on the faster red-wall option tyres, the sole exception to the rule being Marco Andretti who will tackle the first stint of the race on the harder primary tyres from ninth on the grid.

The outlook is for a potentially wet race on Saturday, possibly heavy and maybe even thundery at times. Rain may still be a problem for qualifying for race 2 on Sunday when it's scheduled to take place at 11.25am ET (4.25pm BST), but the rain is expected to clear with the worst of the weather expected to pass to the north of Detroit leaving Belle Isle dry but cloudy, and somewhat cooler than expected.

Race 2 on Sunday is set to start at the same time as Saturday's race, at 3.50pm ET (8.50pm BST).

See full practice 2 times from the Chevrolet Dual in Detroit.