Ignazio D'Agosto vaulted into the WSK World Series KF2 Championship lead thanks to a pair of wins at the American Milville circuit as British duo Chris Lock and Luke Varley struggled to replicate their dominant form from the opening round of the series at Portimao.
Works Tonykart driver D'Agosto set the tone for the weekend early with quickest time in qualifying and although he had to give best to Belgium's Sebastien Bailly in the first heat the Italian star fought back to win heats two and three over Bailly and Japanese driver Yu Kanamaru.
Bailly's consistency meant he would start second alongside D'Agosto in the pre final with Poland's Karol Basz third after three top-five heat finishes for the works Birel team.
Varley, who came into the round second in the points behind Lock, was the best placed Briton in the intermediate classification in fifth place after three top ten finishes but Lock was all at sea and would line up down in 18th place in the 24 kart field after a best finish of 12th in the heats.
D'Agosto drove away from the field to win the pre final by nearly four seconds from Bailly, Kanamaru and leading American Gustavo Menezes, his first championship point scoring victory of the season.
His second win was soon to follow as he led home Bailly by a shade over two seconds in the main final with Basz third, Lock ninth and Varley only 13th and the maximum points haul combined with Lock's misfortune helps elevate D'Agosto into the series lead by 15 points ahead of the final round at Sharm El Sheikh in Egypt.
Bailly lies in a tie for second place with Lock with Kanamaru another five points down in fourth and Varley fifth but still just 22 points off the series lead as the KF2 class comes down to a five driver scrap for championship honours.