After finishing sixth in the opening race, Jones was unable to complete the second after his car suddenly speared straight on into the tyre barriers on lap 20 after previously being hit by team-mate Felix Serralles.
Although he was unscathed from the incident, the Dubai-based driver has now been overtaken by Santiago Urrutia following the Uruguayan’s double victory.
Jones, who had entered the round at the top of the championship standings, now trails Urrutia by 16 points with three races
remaining in the series.
Having been the quickest on both occasions, Urrutia was delighted with his latest performances. “I’m really happy for these two victories,” said the 20-year-old.
“It was great for me, for the team and for the championship. It was a much harder race today with the restarts and Felix pushing me very hard. I was able to use my push-to-pass and keep everyone behind me on the restarts.
“I didn’t expect to take the championship lead this weekend but I came here to win both races and we did that. The team did a great job with the car, it was so quick. But the series is so competitive and there are three long races to go.”
Jones and the drivers will now be back in action next month with the next round in New York on September 3.
Rosenqvist’s No4 Belardi Auto Racing Dallara-Mazda IL-15 was never seriously threatened as the 2015 FIA European Formula 3 champion left everyone in his wake before cruising to a 7.2-second win.
The main interest instead centered on a thrilling battle for second place which eventually fell the way of Brazilian Andre Negrao (Schmidt Peterson Motorsports), who matched his career-best result while fending off the attentions of Kyle Kaiser (Juncos Racing) and Santi Urrutia (Schmidt Peterson).
Carlin’s championship leader Jones finished a lacklustre fifth, chased home by Zach Veach (Belardi Auto Racing) and local favourite Garett Grist (Team Pelfrey). Fellow Toronto native Dalton Kellett (Andretti Autosport) looked set for eighth until nosing into the tire barriers at Turn Eight with just a half-dozen laps remaining.
At least he fared better than teammate and championship aspirant Dean Stoneman, who, cruelly, was unable to even start the race after his car refused to fire up properly before the start.
Rosenqvist made a picture-perfect start to edge clear of the field by Turn One. There was much jockeying of position in his wake, including minor contact between Negrao and Serralles.
As Rosenqvist continued to pad his lead, Negrao and Serralles continued their tussle for second until the Carlin car suffered a punctured left-rear tire and sailed into the escape road at Turn Three.
Negrao didn’t have much respite. Before long, his mirrors instead were being filled by Kaiser, who in turn was being chased by Urrutia.
This threesome provided plenty of excitement as they fought it out for second. For much of the race, Kaiser concentrated his efforts on trying to find a way past Negrao, but later on it was more a case of having to defend from Urrutia. He continued to hang onto third until the flag.
Stoneman’s failure dropped him to fifth place in the title chase, 38 points adrift of Jones who now leads by 268 with Urrutia on 244. Serralles lies third on 236, with Kaiser in fourth on 233.
The series heads next to Ohio for a double-header on July 30-31.
Following the two races at Road America last month, Carlin’s Jones, Andretti Autosport’s Dean Stoneman and Schmidt Peterson Motorsports’ Santiago Urrutia were cited for misconduct which led race director Tony Cotman to place all three under probation.
An Indy Lights statement said any additional incidents, including unsportsmanlike conduct and dangerous or over aggressive driving during the remaining eight races, will result in the loss of a minimum of 10 championship points.
“The notices issued do not preclude a driver from racing hard but serve as a reminder on how to race over the final eight rounds of the championship,” said Cotman.
Heading into Iowa, the practice race for which was held late last night, Jones leads the championship with 213 points, while rookies Stoneman and Urrita are second and third on 194 and 189 respectively.
At the end of the season, the Indy Lights champion gets a Mazda Scholarship valued at $1m, which will guarantee entry into at least three Verizon IndyCar Series events in 2017, including the Indianapolis 500.
Jones, who has started on pole in six of the last seven races, is the only one of the three drivers with previous Indy Lights experience on the tricky, high-banked oval having finished second last year behind teammate Max Chilton.
The 21-year-old has shown remarkable expertise by finishing second in the last three Indy Lights oval races – at Iowa, Phoenix and the Freedom 100, which he lost to Stoneman by just 0.0024 second.
Indy Lights did not specify the indiscretion that led to the probation, but all three were involved in contacts during the two races at Road America on June 25 and 26.
In the first race, Stoneman made contact with Andre Negrao, forcing him off the track. Stoneman had to serve a five-second time penalty afterwards.
In the same race, Urrutia bumped into Juan Piedrahita in Turn 5 on a restart, also resulting in a five-second penalty.
In the second race, Jones blocked Stoneman going into Turn 6, which forced Stoneman on the grass. Jones was then hit from behind by Felix Serralles, causing him to spin and cause damage to the wings.
Qualifying is scheduled for 20:00 GST Sunday, while the 11th round will begin at 23.15.