Monday Motorsports: Scott Dixon Is Flawless in Flawed Return of IndyCar to Detroit Volatility at the Chevrolet Detroit Belle Isle Grand Prix was caused not so much by weather, although it rained, and not by drivers, although tempers flared, but by asphalt, epoxy and the ravages of time. Scott Dixon won the first IndyCar grand prix to be held at Belle Isle since 2008. Dixon's command was remarkable - he led from pole to finish - but the race may be remembered for the poor condition of the circuit. On lap No. 39 the tires of James Hinchcliffe's racecar dug into a rut, as the epoxy filler clinging to the surrounding asphalt gave way under the stresses of raceday. Hinchcliffe, having managed to slow his car before colliding head-on with the tire barrier, escaped injury, but the ensuing red-flag stoppage after 45 laps lasted two hours, prompting some fans to leave. It was raining when the race resumed. The slickness of the track, combined with its dubious dexterity, prompted organizers to cut the race's duration to a 15-lap sprint, for a total of 60 laps rather than the originally scheduled 90. Dixon, the Target Chip Ganassi Racing driver, raced free of cars spinning out behind him to earn his first win of 2012. Dario Franchitti, his teammate and the winner of the 2012 Indianapolis 500, finished second, with rookie driver Simon Pagenaud rounding out the podium. With his fourth-place finish, Will Power retained the overall points lead in the series. He has a 26 point advantage over Dixon. Here are other recent motorsports news items: Jimmie Johnson overpowered the field on Sunday at Dover International Speedway, winning for the seventh time in his Sprint Cup career at the circuit, known as the Monster Mile. Johnson's third victory in four weeks was a fitting display of dominance, with the Hendrick Motorsports driver leading 289 of the race's 400 laps. He was followed by Kevin Harvick and Matt Kenseth. At the Catalunya circuit in Spain, Jorge Lorenzo overtook Dani Pedrosa with six laps remaining to win his third race of the 2012 MotoGP season. Lorenzo has built a 20 point advantage over Casey Stoner, the 2011 champion. Pedrosa was followed onto the podium by Andrea Dovizioso. Stoner, who finished fourth, missed a podium finish for the first time in 20 races. Mazda announced recently it would use the diesel version of its Skyactiv powertrains in the Grand-Am race series" GX class in 2013. The automaker did not disclose which of its cars would be used in the series. The RX-8 sports car has appeared in the Grand-AM GT class since 2007, taking victories at the 2008 and 2010 Rolex 24 at Daytona. The Skyactiv-D powertrain is not offered on Mazdas built for the American market. The American Le Mans Series announced on June 1 it would hold a race at the Circuit of the Americas, outside Austin, Tex., in 2013. The 3.4-mile race circuit is undergoing preparation for the Formula One United States Grand Prix, scheduled for Nov. 18. At SuperNationals, held at Old Bridge Township Raceway Park in Englishtown, N.J., Johnny Gray defeated Ron Capps in the Funny Car final. It was Capps's fifth consecutive appearance in a Funny Car final. Alexis DeJoria, the Funny Car competitor profiled by Wheels on May 31, was defeated by John Force in the first round.