Grijalva has been running since before he was a student at Armijo High School in Fairfield.
Grijalva was born in Guatemala and is a DACA recipient. He cannot run for the United States because he's not a citizen or legal permanent resident.
Instead, Guatemala has invited him to run for them.
Grijalva, a student at Northern Arizona University, his coach and fellow runners there will be leaving to Tokyo Sunday.
“He's been an excellent student, he's been a top athlete and a wonderful teammate,” said Mike Smith, running coach at Northern Arizona University. “And now, he's got a chance to represent us and his country at the highest levels of competition. So, he's an easy guy to root for.”