SPARTA, Ky. — Scott Dixon is starting to look unstoppable.

The New Zealander came from behind tonight at Kentucky Speedway, passing Helio Castroneves on the final straightaway to win the Meijer Indy 300. It was the second win in a row and the record-tying sixth victory of the season for Dixon, trying to win his second IndyCar Series championship.

Castroneves, still trying for his first victory of the season and his first series title, tried to get it on fuel strategy. It looked as if Castroneves had it when he took the lead with six laps to go when Dixon, who had dominated most of the 200-lap race, was forced to make a fuel stop.

Dixon came out just over 6 seconds behind the Brazilian, but steadily cut into the margin, finally passing Castroneves as the leader slowed coming off the fourth turn on the 1.5-mile oval, out of fuel.