Indianapolis ? Tomas Scheckter is fast, aggressive and outspoken. Sort of like his boss, Eddie Cheever.

“He pushes the team every day,” said Cheever, a former Indianapolis 500 winner. “I can’t do anything with him. We play pool, we get in an argument. We play squash, we get in an argument. We play ping-pong, we get in an argument.”

Scheckter, the son of 1979 Formula One champion Jody Scheckter, drives for Cheever’s Indy Racing League team. He was one of six drivers who tested at the Speedway on Saturday during the annual rookie orientation program.

His biggest confrontation with Cheever came after he tried to pass his boss during a race at Homestead-Miami Speedway last month. They bumped wheels, and Cheever went into the wall.

“He has the attitude of what you’d expect of a 21-year-old who, you know, thinks he should be the fastest in every session. It was a difficult relationship in the beginning,” Cheever said.

Scheckter, runner-up in the British Formula 3 series in 2000 and runner-up in the Formula Nissan championship last year, passed his IRL rookie test in January and is 16th in the standings after three races this season.

He took his first laps at Indianapolis last week during private testing. He practiced briefly Friday before rain closed the track. He was back again Saturday to begin the mandatory Indy rookie test, a series of 10-lap runs starting at 200 mph and increasing in 5 mph increments.

Scheckter, Rick Treadway, Anthony Lazzaro, George Mack and John de Vries finished all four speed phases of the test on Saturday. Laurent Redon completed three of the four phases and will finish the test in May. Also, Scott Harrington, whose only previous start at Indy was in 1996, completed a refresher test.

Practice for the May 26 Indy 500 begins on May 5.

“It’s unbelievable just to be here, an unbelievable experience. So much history, so many great champions have left here, just to be on the circuit is great,” Scheckter said.