The day opened with car owner Bryan Herta driving a single parade lap around Indianapolis Motor Speedway in the car Wheldon drove to victory last year. Fans were given white sunglasses to wear on laps 26 and 98, marking the car numbers Wheldon used in his two wins.
It was Susie Wheldon's first trip to any race track since her husband's death, and she watched from Dixon's pit stand with his wife, Emma.
So it was apt on this hot day — the temperature hit 91 degrees, just one shy of the Indy 500 record from 1937 — that one of the most competitive races in history ended with a frantic push from Wheldon's friends. Ten drivers swapped the lead 35 times, shattering the record of 29 in the 1960 race won by Jim Rathmann.
Until the last lap, when Sato made his move for the win, the race was close but uneventful.
The only multi-car accident came when a spin by Mike Conway collected Will Power, who came to Indy as the series points leader and winner of the last three races this season. It was a somewhat frightening accident as Conway, who broke his front wing when he hit one of his crew members on pit road, hit the outside wall and his car tilted on its side before coming to rest. And Helio Castroneves had to deftly maneuver past a bouncing tire that still grazed one of his own wheels.
Besides that, though, the race was slowed by just seven other cautions — including the one on the last lap — for 39 of the 200 laps.
Marco Andretti, who went into Sunday believing the race "is mine to lose," was strong at the start, but a series of adjustments were not to his liking and he unraveled on his team radio before spinning to bring out the final caution with 13 laps remaining.
Franchitti and Dixon battled back and forth in the final third of the race, with Sato consistently in the mix. Then came Kanaan, from nowhere it seemed, but he was unable to hang on to the lead on the restart after Andretti's crash brought out the yellow with 13 laps to go.
Andretti said the wreck "definitely rang my bell."
Everyone thought the race would go to a Chevrolet driver for either Andretti Autosport or Penske Racing, which won the first four races of the season and swept the front two rows in qualifying. But in the end, it was three Hondas fighting for their first win of the season.
After the last restart, Franchitti pulled past Dixon for the final time, then went for the lead, pulling even with Franchitti. "Job done," he said he thought, but he went in too low and the tires appeared to touch.
"It looks like he didn't give me enough room to go there," Sato said. "I was a little below the white line. I had nowhere to go."
Sato said the cars never actually hit but the white line marking the inside of the track "was less than touching my own car — so, you know, I mean almost on the grass."
Franchitti coasted across the line under a yellow caution flag to become the 10th driver to win at least three Indy 500s.
This was the second year in a row that a crash on the final lap affected the outcome. In 2011, rookie JR Hildebrand was leading going into the final turn when his car slammed into the wall, allowing Wheldon to cruise past and take the checkered flag.
"I was side by side with Takuma," Franchitti said. "We hit and I managed to keep it out of trouble."
The victory snaps a disappointing start to the season for Franchitti, who has won the last three championships but seemed stumped by IndyCar's new car through the first four races. In breaking out Sunday for his 31st victory, he's now in a tie with Sebastien Bourdais and Paul Tracy on the all-time wins list.
One more win will move Franchitti into seventh place in the record books. The only drivers ahead of him? The giants of open-wheel racing: three Unsers, two Andrettis and A.J. Foyt, the all-time wins leader.
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