NEWTON, Iowa (AP) — Ryan Hunter-Reay buried his post-Indianapolis 500 slump with a set of fresh tires that pumped new life into his title hopes. Helio Castroneves finished eighth, taking sole possession of the series points lead. Kanaan started on the front row with Dixon, the pole sitter, following promising qualifying sessions for a team that has struggled all year. Though Kanaan faded on old tires, he heads to next week's races in Toronto with as much momentum as he's had in his first season with Ganassi. Penske entered the weekend with three of the series' top four drivers; Castroneves, co-leader Will Power and the surging Juan Pablo Montoya. [...] Penske had struck out in each of its previous seven trips to Iowa — and Power (ninth) and Montoya (19th) started from less than optimal positions. The start of the race was moved up 30 minutes to avoid storms that peppered much of Iowa on Saturday night, but it was red-flagged after just 39 laps because of light rain.