Progression
See how Zai'Brien is progressing
Every mark Zai'Brien has run, plotted over time — watch times drop race by race, catch breakout performances, and compare season to season for every event.
Join MileSplit PRO Already a PRO member? Log inProgression
Every mark Zai'Brien has run, plotted over time — watch times drop race by race, catch breakout performances, and compare season to season for every event.
Join MileSplit PRO Already a PRO member? Log in