Marco Andretti led the times after a curtailed first practice session on Friday morning, with a lap of 1:21.0211s (90.643mph) ahead of this weekend's Grand Prix of Baltimore.

As is normally the case with the first practice session of the weekend, the first half was intended to be reserved for rookies and those outside the top ten in the championship.

However the one-hour session was brought to a close after 30 minutes because of concerns with how cars were being launched into the air over the railroad tracks that intersect the front stretch. Last year the section had been ringed off using a temporary chicane, but that has been removed for this year's running.

"Biggest hit I ever had in a racecar," was Simon Pagenaud's view after being one of those caught out.

There was also a very early red flag in the session after Charlie Kimball stopped on track at turn 5 with smoke and fluid coming out of the #83.

Practice 1 times

1. #26 Marco Andretti Andretti (C) 90.643mph 1:21.0211s (7 laps)
2. #8 Rubens Barrichello KVR (C) 90.219mph 1:21.4021s + 0.3810s (10 laps)
3. #27 James Hinchcliffe Andretti (C) 89.791mph 1:21.7899s + 0.7688s (5 laps)
4. #5 EJ Viso KVR (C) 89.479mph 1:22.0750s + 1.0539s (6 laps)
5. #78 Simona de Silvestro HVM (L) 89.396mph 1:22.1513s + 1.1302s (8 laps)
6. #11 Tony Kanaan KVR (C) 89.247mph 1:22.2887s + 1.2676s (3 laps)
7. #3 Helio Castroneves Penske (C) 89.011mph 1:22.5067s + 1.4856s (3 laps)
8. #12 Will Power Penske (C) 88.925mph 1:22.5865s + 1.5654s (3 laps)
9. #18 Justin Wilson Dale Coyne (H) 88.747mph 1:22.7523s + 1.7312s (7 laps)
10. #4 JR Hildebrand Panther (C) 88.678mph 1:22.8168s + 1.7957s (6 laps)
11. #19 James Jakes Dale Coyne (H) 88.534mph 1:22.9510s + 1.9299s (5 laps)
12. #10 Dario Franchitti Ganassi (H) 88.464mph 1:23.0164s + 1.9953s (5 laps)
13. #15 Takuma Sato Rahal (H) 88.384mph 1:23.0918s + 2.0707s (6 laps)
14. #22 Oriol Servi? Panther/DRR (C) 88.356mph 1:23.1186s + 2.0975s (3 laps)
15. #77 Simon Pagenaud Schmidt (H) 87.185mph 1:24.2342s + 3.2131s (5 laps)
16. #2 Ryan Briscoe Penske (C) 87.029mph 1:24.3858s + 3.3647s (4 laps)
17. #14 Mike Conway AJ Foyt (H) 86.634mph 1:24.7700s + 3.7489s (5 laps)
18. #20 Ed Carpenter ECR (C) 86.02mph 1:25.3753s + 4.3542s (4 laps)
20. #9 Scott Dixon Ganassi (H) No time
21. #38 Graham Rahal Ganassi (H) No time
22. #98 Alex Tagliani Bryan Herta (H) No time
23. #28 Ryan Hunter-Reay Andretti (C) No time
24. #83 Charlie Kimball Ganassi (H) No time

Total laps: 100


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