Simon Pagenaud, Scott Dixon and Will Power were all under track-record pace in the third practice for the 2017 GoPro Grand Prix of Sonoma.
The Verizon IndyCar Series championship comes down to five drivers within striking distance and two separated by just three points in a classic Penske versus Ganassi battle.
Josef Newgarden led a Team Penske sweep of Practice 2 at Sonoma Raceway with a lap time quicker than the track record.
Group One Thousand One, new to the Verizon IndyCar Series paddock, will back Zach Veach's No. 26 Andretti Autosport Honda in 2018.
Championship leader Josef Newgaren topped the opening practice session at Sonoma Raceway, leading a Team Penske sweep of the top three.
Track facts, entrant facts, the weather forecast, session results and more for the 2017 GoPro Grand Prix of Sonoma.
Josef Newgarden's error at Watkins Glen put perennial championship challenger Scott Dixon within three points of the championship lead heading into the season finale at Sonoma Raceway.
Alexander Rossi started from pole for the first time in his career and won for the second time since joining the Verizon IndyCar Series.
Sebastien Bourdais exhibited his skill driving on a wet track with the fastest lap in morning warm-up at Watkins Glen.
Alexander Rossi beat Scott Dixon to his first career pole at Watkins Glen for the INDYCAR Grand Prix at The Glen.