Marco Andretti tops Fast Friday at Indy 500

Marco Andretti's startling morning speed was enough to keep him in top spot in Indy 500 practice as drivers spent a tough afternoon struggling to get a strong four-lap average

While Takuma Sato has said the IMS track surface has been surprisingly kind to the Firestones over race stints, the track conditions on Friday threw up the problems predicted by Simon Pagenaud's race engineer Ben Bretzman when it came to qualifying simulations.

The drivers who were trimmed out could start off with a really strong first lap but the loss of tyre grip caused by 1.5-bar boost sending cars into the turn 8-10mph faster than yesterday, and increased weight transference thanks to the aeroscreen's position and mass, would cause up to 4mph to bleed away by the fourth lap of a run.

Other drivers tried keeping more downforce on, and while this lowered their ultimate speed, they were rewarded by greater consistency across the four laps.

Andretti's remarkable lap from this morning inevitably held firm as track temperatures increased, while Daly's lap which also received a tow kept him second.

A late improvement by Chip Ganassi Racing's Scott Dixon saw the 2008 Indy winner jump to third fastest overall and second on the no-tow speeds, just ahead of Andretti Autosport's Ryan Hunter-Reay who was best of the no-tows, and Spencer Pigot of Citrone/Buhl Autosport with RLL.

Alex Palou made a late improvement to clock sixth for Dale Coyne Racing with Team Goh, while Will Power clocked the best Penske speed of the day but was still only 11th.

Fernando Alonso turned 52 laps, but was left down in 25th.

Tomorrow's action sees an hour of practice divided into two groups - 8.30-9.00am and 9.00-9.30am (all local time).

Qualifying commences at 11.00am and the 33-car field's initial qualifying order, drawn this evening, is as follows: 1. Rahal, 2. Sato, 3. Kellett, 4. VeeKay, 5. Harvey, 6. Dixon, 7. Pigot, 8. O'Ward, 9. Newgarden, 10. Power, 11. Karam, 12. Rossi, 13. Alonso, 14. Hunter-Reay, 15. Veach, 16. Ericsson, 17. Askew, 18. Rosenqvist, 19. Carpenter, 20. Hinchcliffe, 21. Hanley, 22. Davison, 23. Palou, 24. Ferrucci, 25. Daly, 26. Kimball, 27. Pagenaud, 28. Andretti, 29. Kanaan, 30. Herta, 31. Chilton, 32. Castroneves, 33. Hildebrand.

The drivers will then get a chance to take multiple runs until 4.50pm, but most observers are expecting to see the fastest times at the start of the session, as Indianapolis is forecast to reach a peak temperature of 31 degrees Celsius.

The top nine qualifying times by day's end will then move forward to a Fast Nine shootout on Sunday, preceded by a half-hour practice from 11.00-11.30am. The fight for pole - just one run each - will be held 1.15-2.15pm.

With boost then turned back down to raceday levels, the 33-car field will resume practicing at 3.30pm, with a 2hr30min session. This will be the final practice until a two-hour session on Carb Day (Friday 21 August).

Practice day 3 result

Pos Driver Team Car Gap
1 Marco Andretti Andretti Autosport Dallara/Honda 38.5454s
2 Conor Daly Ed Carpenter Racing Dallara/Chevrolet 0.1914s
3 Scott Dixon Chip Ganassi Racing Dallara/Honda 0.1992s
4 Ryan Hunter-Reay Andretti Autosport Dallara/Honda 0.2269s
5 Spencer Pigot Citrone Buhl Autosport with RLL Dallara/Honda 0.2283s
6 Alex Palou Dale Coyne Racing Dallara/Honda 0.2495s
7 James Hinchcliffe Andretti Autosport Dallara/Honda 0.2533s
8 Takuma Sato Rahal Letterman Lanigan Dallara/Honda 0.2678s
9 Alexander Rossi Andretti Autosport Dallara/Honda 0.2713s
10 Marcus Ericsson Chip Ganassi Racing Dallara/Honda 0.2873s
11 Will Power Team Penske Dallara/Chevrolet 0.3138s
12 Jack Harvey Meyer Shank Racing Dallara/Honda 0.3147s
13 Colton Herta Andretti Harding Dallara/Honda 0.3156s
14 Graham Rahal Rahal Letterman Lanigan Dallara/Honda 0.3754s
15 Zach Veach Andretti Autosport Dallara/Honda 0.3836s
16 Charlie Kimball A.J. Foyt Enterprises Dallara/Chevrolet 0.4391s
17 Josef Newgarden Team Penske Dallara/Chevrolet 0.4861s
18 Patricio O'Ward Arrow McLaren SP Dallara/Chevrolet 0.4864s
19 Oliver Askew Arrow McLaren SP Dallara/Chevrolet 0.4989s
20 Felix Rosenqvist Chip Ganassi Racing Dallara/Honda 0.5117s
21 Rinus Van Kalmthout Ed Carpenter Racing Dallara/Chevrolet 0.5288s
22 Simon Pagenaud Team Penske Dallara/Chevrolet 0.5529s
23 Santino Ferrucci Dale Coyne Racing with Vasser Sullivan Dallara/Honda 0.5589s
24 Tony Kanaan A.J. Foyt Enterprises Dallara/Chevrolet 0.5942s
25 Fernando Alonso Arrow McLaren SP Dallara/Chevrolet 0.6212s
26 James Davison Dale Coyne Racing Dallara/Honda 0.6249s
27 Ed Carpenter Ed Carpenter Racing Dallara/Chevrolet 0.6596s
28 Dalton Kellett A.J. Foyt Enterprises Dallara/Chevrolet 0.7390s
29 Helio Castroneves Team Penske Dallara/Chevrolet 0.8503s
30 J.R. Hildebrand Dreyer & Reinbold Racing Dallara/Chevrolet 0.8807s
31 Sage Karam Dreyer & Reinbold Racing Dallara/Chevrolet 0.8959s
32 Max Chilton Carlin Dallara/Chevrolet 0.9959s
33 Ben Hanley DragonSpeed Dallara/Chevrolet 1.9794s
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