Dixon, who outpaced Sebastien Bourdais in a two-lap sprint to the finish Saturday, had a much easier time in Sunday's second race on the 1.75-mile, 11-turn street circuit.
He passed current IndyCar points leader Helio Castroneves after a late accident involving Ed Carpenter had necessitated another two-lap sprint to the finish, claiming his third consecutive victory overall -- Dixon also won last week's event at Pocono Raceway.
The Chip Ganassi Racing driver pocketed a $100,000 bonus for claming both weekend races and pulled to within 29 points of the IndyCar lead.
Castroneves garnered second place, followed by Bourdais, Dario Franchitti and E.J. Viso.
Notable deaths of 2014 [PHOTOS]