Thiago Medeiros took another step towards taking the Menards Infiniti Pro Series with a dominant start to finish victory in the Chicagoland 100.

Medeiros, starting from pole position for the sixth time this season, beat Jeff Simmons to the finish line by just 0.0586secs to claim win number five of the year.

Al Unser was third and Arie Luyendyk Jr. fourth while brothers P.J. and James Chesson finished fifth and sixth, respectively.

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With closest rival Paul Dana finishing in eighth, Medeiros now has a comfortable lead in the championship battle with just two races remaining.

"It was great," Medeiros said. "The team gave me the best car out there today. We had the best car out yesterday, too.

"I knew that some other guys could be working together, trying to make a move in the last lap. I just made sure that I did a good start and then I was taking my time, because I knew that everybody would be waiting for the last laps, trying to do something.

"They gave me the great car out there today. I was just trying to make some change in my line so nobody could go around me. I'm really happy to get 52 points more for the championship.

"We still have two races left. Our plan is to keep winning, keep leading the most number of laps that we can, then we can get a championship pretty soon."