INDIANAPOLIS – Defending NHRA Top Fuel world champion Brittany Force powered to the top of the Top Fuel leaderboard on day two of Chevrolet Performance U.S. Nationals testing on Thursday.

With the Chevrolet Performance U.S. Nationals scheduled for Aug. 29-Sept. 3, the test session allows teams an opportunity to dial in their respective tune-ups prior to the final regular season race of the NHRA schedule.

Force drove her Monster Energy dragster to a run of 3.739 seconds at 330.55 mph to send her to the top of the day’s leaders.

“I’m excited to be back out here with my team, because we’ve been struggling this year so this testing is very important to us,” Force said. “We are fighting to stay in the top 10 right now so we are trying to get this car figured out and setup next weekend so we can have a strong race.”

Eight-time Top Fuel world champion Tony Schumacher powered his U.S. Army dragster to a 3.779-second pass at 329.58 mph to improve upon his run from Wednesday and record the second-best pass of the day.

Clay Millican, the No. 1 qualifier at the 2017 Chevrolet Performance U.S. Nationals, had a run of 3.979 seconds at 244.96 mph on the day as he looks for his first win at Indianapolis.

“This has been a great test session because every time we have stepped on the gas this car has responded well,” Millican said. “Winning this event would be awesome, because we want to enter the Countdown second in the standings. The guaranteed way to do that is to win the race, which I feel like we can do every time we show up.”

Three-time Top Fuel world champion Antron Brown topped out at 6.278 seconds at 108.45 mph on the day, as his Matco Tools team looks to get dialed in prior to race weekend.

“This test session has gone well for us so far, we’ve been trying some different clutch discs out, but we have been on the aggressive side to see what this track will hold,” Brown said. “We are just working on making our package better and testing some new parts so we can come out here and be ready for the first round of qualifying on Friday.”

The current Funny Car points leader Courtney Force jumped atop the pack after driving to a 3.884-second run at 327.82 mph as she aims for her first win at Indianapolis. Defending Funny Car world champion Robert Hight had the second-best run of the day with a 3.898-second pass at 331.20 mph as he looks to enter the Countdown in position for his second straight title.