One point separates leaders in Firestone Indy Lights
Antinucci, who had recorded a victory and three runner-up spots in the first five races, dropped five positions to finish a season-low 16th in the Milwaukee 100 on The Milwaukee Mile on June 1.
Battistini advanced six spots but still finished 14th. Eight days earlier, he won the Firestone Freedom 100 at the Indianapolis Motor Speedway – his second victory of the season on an oval.
J.R. Hildebrand is 15 points back, AFS Racing/Andretti Green Racing teammates Raphael Matos (-31) and Arie Luyendyk Jr. (-50) and Team Moore Racing's Jeff Simmons (-58) are in the hunt heading to Iowa Speedway.
Hildebrand, who started 14th, was the biggest mover of the race by finishing fifth.
"I wasn't looking forward to starting mid-pack here because it's easy to get caught up in something, but the RLR/Andersen team gave me a great car," he said. "I screwed up in practice and crashed, but they fixed the Allied Building Products car and it was great for the race. To be able to put it into the top 10, let alone the top five, shows that the guys really earned their pay here this weekend."
Matos recorded his best oval finish (third), following Simmons and race winner Bobby Wilson across the line at Milwaukee.
"I was happy for the team; they deserve better results than we've had in the past two races," said Matos, who finished 10th in the Firestone Freedom 100 and 19th at Kansas Speedway. "We improved quite a lot from qualifying (seventh). I think the car was quite good in the end.
"This place is so difficult in traffic. It's very difficult to pass. Once I was in third, I just wanted to finish and collect points, which is good for the championship. Now we just have to work harder and harder trying to maximize our car to the ovals and then we'll be there in the end fighting for the championship."