He might have just won one of sport’s most prestigious events, but it wasn’t long before Jordan Spieth’s thoughts turned to his autistic sister in the glow of victory.

The 21-year-old golfer equaled Tiger Woods’ 1997 record winning score of 18 under par to realize his childhood ambitions of donning the green jacket on Sunday as he swept through the field to become Masters champion at Augusta.

An ice-cool display made him the second-youngest winner — behind only Woods, who was 155 days younger that year — and only the fifth man to have led from start to finish over the tournament’s four days.

“I miss her a lot, and I wish she could have been here,” Spieth told CNN’s Don Riddell in the aftermath of his triumph as he opened up about younger sibling Ellie, who was not able to attend the tournament.

“But I can’t wait to get back to her and maybe let her try on the jacket.

“I’ll have to bring her back a present from here. That’s what she’ll be expecting.”

Amid all the pressure of playing professional golf, Spieth’s 14-year-old sister provides him with perspective.

“How has she shaped my upbringing? Well, she’s the most special part of our family. She’s the funniest part of our family,” he said.

“I love having her around. She’s an incredible sister, my biggest supporter. She is somebody who you can watch and then reflect on the big picture of life and understand that all these frustrations in a day, or in a round of golf, are really secondary.

“We wouldn’t have that realization without her.”

At the age of just 14, the prodigy from Texas — who was named after basketball legend Michael Jordan — had been clear about what he wanted: his aim was to take the Masters title one day.

And he betrayed virtually no sign of nerves throughout his stunningly dominant performance, letting slip only a muttered “oh dear” when he marginally sliced a tee shot halfway through the final round.

Last year, Spieth lost the lead just before the nine-hole turn on the last day — but he never looked like being denied this time, beating Phil Mickelson’s Masters record of 26 birdies for good measure.