Likewise, Calvin gave up soccer and basketball after his freshman year at Lansdowne.
"I remember the first day of soccer practice freshman year, I won the 40-meter dash and everybody said I was fast," said Calvin, who got the same compliments while doing sprints on the basketball court.
His dad, Stanley, was a track coach in Jamaica, and has been his motivator. Yelnats is Stanley spelled backwards, which is an ironic name for such a forward-thinking student-athlete.
Nevertheless, Yelnats said his dad "Has always pushed me ever since I was little."
Parker saw that from the beginning.
"I would have to say it's his work ethic that stands out," Parker said. "It's up to them to do the work. We just work around their schedules."
Although unable to perform in the state spotlight at Morgan State, Calvin did make an impression on the same campus earlier in the spring.
He won the 400 and was third in the 200 and fourth in the 100 at the Morgan State Invitational.
During the indoor season last winter, Calvin won the 300 (37.70) and was second in the 500 (1:12.40) at the 2012 Baltimore County championships, after winning the 500 and taking second in the 300 in 2011.
His biggest disappointment came after the Vikings thought they had won the 1,600 meter relay at the 2012 county meet.
"We were disqualified for a uniform violation," he said. "That was very frustrating."
Despite that setback, Calvin was voted Baltimore County's top runner of the year.
"That was definitely a great thing to be recognized by all the other county coaches," Parker said.
"I'm ready to meet my new teammates and I'm excited for college," said Calvin, who plans to major in economics. "I like New York City and there are lots of opportunities."
So far in his young life when opportunity knocks, Calvin is eager to answer.