And if you live anywhere in the South Island, and he came to visit you, he would be the fastest kid on your block, too.
Grant, while relatively short and new to competitive sprinting, is rapid. He won the senior boys 100m at the South Island secondary schools championships this year, and ran a personal best of 11.08sec in Australia in March.
But talk to him about his sprinting, and the mind boggles at how quick he potentially could be.
His story is one of a young man in a small town lacking the facilities and coaching to harness his speed. He spends most of his time training alone in Oamaru, and usually drives himself to Dunedin twice a week to train at the Caledonian.
Questions about what makes him go so quickly are met with a frank admission that he does not know.
He had given thought to enrolling at Otago Boys' High School, but with just one year of his schooling remaining he was unsure if it would be worthwhile.
His parents, Sally and Wayne, had been "really supportive with the travel". But living in a larger city, with access to better facilities and coaching, would be a considerable advantage, he said.
"It would definitely be so much easier. It's really hard by myself because I can't tell if I'm doing anything wrong."
A lot of athletic potential goes unfulfilled in Oamaru, he said.
"I think it's because Oamaru athletics is not really a prominent sport. They do it at school, but after that, that's it.
"I definitely know people at this school who could do really well if they wanted to."
It was not long ago that Grant was just another pupil with raw talent.
"I always did well at North Otago regionals," he said.
"It wasn't until high school that I realised how good I was."
He began training properly in 2009, and shocked himself with the speed with which he won the junior boys 100m at the South Island secondary schools championships that year.
That result led to an impressive fourth place in the senior boys 100m at the nationals last December.
He followed that up with 14th from 26 runners in the 100m at the Commonwealth Youth Games in the Isle of Man early last month.
His short-term goal is to "get under 11 [seconds]" for the 100m and to "take out" the national 100m crown either this year or next.
Two sprinters from Auckland and one from Waikato should supply his toughest competition, with any of the four capable of winning on the day, he said.
He will have two more opportunities to qualify for the world junior championships, but said the 10.5sec qualification mark would prove a tough barrier to break through.
Blair Grant
Age: 17.
School: Waitaki Boys' High School.
Sport: Athletics.
Achievements: South Island schools 100m champion, fourth in 100m at New Zealand schools championships, Commonwealth Youth Games representative.
