Johnson Power Rankings
The world authority on 200+ mile ultramarathon running — weekly, data-driven, course-difficulty-adjusted.

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Tandi Sherlock

Women · Americas

Ratings

Athlete ratings by board
BoardGenderRatingRankMove
ContinuousWomen2,18712• new
OverallWomen2,18712• new

Why this rank

The Overall rating is the time-decayed mean of this athlete’s best 3 in-window performance scores (highlighted below). Each score = base × difficulty × field-strength × quality.

Career results (200+ mile tier)

Cocodona 250 Mile Race · May 4, 2026 · 250mi continuouscounts toward rating
place 42 · 3d 14:31:40 · difficulty 2.45 · field 2.30 · quality 0.46
2,589
The Mammoth 200 · Sep 26, 2025 · 208mi continuous
place 34 · 3d 07:44:18 · difficulty 1.01 · field 2.07 · quality 0.36
757
Arizona Monster 300 · Apr 4, 2025 · 304mi continuouscounts toward rating
place 41 · 4d 23:17:21 · difficulty 2.20 · field 2.26 · quality 0.56
2,795
Cocodona 250 Mile Race · May 6, 2024 · 250mi continuouscounts toward rating
place 55 · 3d 21:17:51 · difficulty 2.45 · field 2.43 · quality 0.45
2,682