Bolles graduate Caitlin Collier enters this week's IAAF World U-20 Championships in Finland as the early favorite in her best event, the 800 meters.

Today, fastest in Florida. Next week, fastest in the world?

For Caitlin Collier, it's possible.

Already the top middle-distance high school runner in the nation, the recent Bolles School graduate earned the top overall seed for the women's 800 meters at the IAAF World U-20 Championships in Tampere, Finland, where she represents the United States against a global field.

Collier will race in the preliminary heats of the 800 early Tuesday, at roughly 3:40 a.m. Eastern Daylight Time. If she progresses, she would then compete in the semifinals Wednesday and the final Thursday.

Based on times recorded by the IAAF this year, the 11-time Florida high school individual track champion enters the 800 atop the list of international favorites.

Collier's best 800-meter time of 2:00.85, set June 2 at the Music City Distance Carnival in Nashville, Tenn., ranks first in the world this year among participating women under 20.

The only other competitors in Tampere to break 2:02 are Sammy Watson, who edged out Collier at the USATF junior final, American teammate Avi'Tal Wilson-Perteete and the Ethiopian pair of Diribe Welteji and Fireweyni Haile.

Collier's chances of victory improved further when Australian 16-year-old Keely Small, whose mark of 2:00.81 is the world's fastest junior time this year, elected not to enter in order to focus on October's Youth Olympic Games in Buenos Aires.

Though the 800 is regarded as Collier's best distance, she's also competing in the 1,500 from Friday through Sunday after placing second at last month's USA Track and Field junior outdoor championships.

Her season-best 1,500 time of 4:26.03 ranks 32nd of the 34 qualifiers, although she has run the distance infrequently in competition. FHSAA events use the 1,600-meter distance rather than the 1,500.

Collier, set to begin her college life at Stanford next month, is vying to become the second world junior champion from Jacksonville in just four years. Stanton's Kendal Williams won the men's 100-meter dash at the 2014 championships in Eugene, Ore.