Scott McLaughlin topped a vital second practice at Nashville in a perfect session for Team Penske who locked out the top three with Josef Newgarden second ahead of Will Power.
Alexander Rossi set the fourth quickest time on the bumpy streets of Nashville as Alex Palou and Pato O’Ward struggled outside the top 10.
A flurry of cars left the pit lane at the green light to gain valuable track time at the Nashville Street Circuit on a humid day in the Music City.
Dutchman Rinus VeeKay’s session started in the worst possible way as the Ed Carpenter Racing driver clattered the barrier bringing out the red flags.
Practice resumed with 42 minutes remaining of the one hour session, Rossi set the first representative time of the session with a 1:18.9760 for Andretti Autosport.
American driver Graham Rahal damaged his front wing at Turn 6 but managed to continue in the session and return to the pit lane.
The streets of Nashville continued to bite as Colton Herta locked up and ran wide at the end of the Memorial bridge. The 22-year-old kept his engine running after his slight mistake.
Rahal rejoined the track with 33 minutes remaining after his earlier incident. New Zealander McLaughlin topped the times with a 1:16.2966 half a second in front of Newgarden and Power as Team Penske had all three of their cars in the top three.
Formula Formula 1 driver Romain Grosjean went to the top of the timesheets setting a 1:16.2754 fractionally quiver than McLaughlin as the times continued to tumble.
Last years winner at Nashville Marcus Ericsson found himself down the order in P17 just behind Simon Pagenaud with 25 minutes left on the clock.
A plethora of big names languished outside the top 10 for much of the session including Arrow McLaren SP driver Pato O’Ward and reigning champion Alex Palou in P14 and P15 with 18 minutes left.
Kyle Kirkwood produced a strong session for AJ Foyt Racing sitting inside the top 10 in an ultra competitive session.
Team Penske continued to show good speed as Power became the first driver to break the 1:15 barrier setting an impressive 1:15.8415 ahead of Swedish driver Felix Rosenqvist.
Ericsson spun at Turn 11 in his Chip Ganassi Racing car in a harmless error, Herta bounced back from his earlier mistake and posted a competitive 1:16.1972 to go into sixth place with ten minutes to go.
Power was usurped atop the times as his team mates McLaughlin and Newgarden went quicker with Team Penske dominating the session.
Rosenqvist hit the wall and damaged his Arrow McLaren SP’s left rear suspension, in a tricky sequence for McLaren Pato O’Ward locked up at Turn 11 but avoided contact with the barriers with three minutes left.
Team Penske locked out the top three with McLaughlin ahead of Newgarden and Power. Rossi finished fourth in front of Kirkwood and Rosenqvist with Grosjean in P7.
Herta ended Practice 2 in eighth slightly quicker than Christian Lundgaard as David Malukas rounded out the top 10.