Chip Ganassi Racing teammate Tony Kanaan and Scott Dixon were 1-2 in the opening 45-minute practice session for the Verizon IndyCar Series’ Iowa Corn 300 at Iowa Speedway.
Kanaan set his flier of 179.218 mph on his fifth lap and Dixon 179.113 on his third.
The pair of drivers who dominated the 2014 edition of the race before being caught out versus other drivers on new tires were the only two drivers north of 179 mph at the 0.894-mile oval in first practice, held in scorching conditions of 92 degrees Fahrenheit ambient, 130 on track and with 62 percent humidity per Firestone.
Two-time and defending Iowa winner Ryan Hunter-Reay was third ahead of fellow Americans Charlie Kimball and Josef Newgarden.
Series points leader Juan Pablo Montoya was sixth ahead of Milwaukee winner Sebastien Bourdais.
There were two yellow flags for track inspection and Jack Hawksworth went behind the wall with a mechanical issue, apparently a loose hose, but the A.J. Foyt Enterprises team fixed it and got the Englishman back out.
Second and final practice runs from 6 to 6:45 p.m. CT and local time.
Speeds from first practice are below: