Australia's Will Power was left to rue another missed opportunity after a heated on-track battle with his teammate cost him the IndyCar series outright lead.
Power led for 69 laps in Sunday's event at Pocono Raceway in Pennsylvania before copping a late drive-through penalty for blocking fellow Team Penske driver Helio Castroneves.
He wound up finishing 10th, erasing his 39-point buffer on the championship standings to now sit level with Castroneves at the top.
Stablemate Jaun Pablo Montoya won the race - his first open-wheel victory in North America in 14 years.
"We were pretty good today, but unfortunately I made a mistake," two-time series runner-up Power told FoxSports.com.