Mitchell, Phillips tons guide New Zealand to 337-8 in ODI decider
New Zealand slipped to 5-2 and then 58-3 after being invited to bat first in Indore before Mitchell and Phillips put on 219 runs for the fourth wicket.
Mitchell made 137 and Phillips hit 106 off 88 balls to take the attack to the opposition bowlers as New Zealand look for their first ODI series win in India.
The in-form Mitchell picked up where he left off from his match-winning 131 not out in the previous match, which levelled the series at 1-1.
Mitchell reached his ninth ODI ton with a single of Ravindra Jadeja, letting out a scream and celebrating with his partner.
Phillips reached his hundred off Arshdeep Singh and pointed his bat to the sky as the crowd and the New Zealand dressing room stood to applaud.
Arshdeep finally got Phillips caught behind to end the marathon stand and Mitchell soon followed after falling to Mohammed Siraj.
New Zealand wobbled with four more wickets but captain Michael Bracewell hammered an unbeaten 28 off 18 balls to boost their total.
Left-arm quick Arshdeep struck in the first over when he bowled Henry Nicholls for a first-ball duck and Harshit Rana removed Devon Conway for five in the next over.
Rana stuck again to remove Will Young for 30 but Mitchell and Phillips then rebuilt the innings and put New Zealand on course to a challenging total.
The series will be followed by five T20s ahead of the T20 World Cup in India and Sri Lanka between February 7 and March 8.