By the chequered flag, Bourdais had a comfortable margin over Junqueira, while the Brazilian had the same gap again to third placed Tagliani. Servia was rewarded for his strong showing with a season's best fourth for the Dale Coyne Racing team, earning a point for most places gained during the race.
Jimmy Vasser claimed fifth, ahead of leading rookie A.J Allmendinger, who closes the gap on Wilson in the Rookie of the Year standings to a single point.
The day however belonged to Bourdais, whose victory earned him back-to back victories in the Cleveland event.
"This was probably the easiest race of my short Champ Car career," he said. "There was the pileup in Turn One at the start of the race and all I could see was smoke. I aimed for the apex, and then realized there was no one around me.
“It was challenging for the start, everyone piled up in the first turn, and then it was an uneventful race except for the track inspection. We had a very strong car and a very good lead and we lost that and we still were able to build it back.
“The McDonald's car was good all weekend and my team did a great job giving me a good car. It is a great sensation to be back here in Cleveland and win for the second time at this event and the second time this season."