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

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Duc Do

Men · Oceania · b. 1972 (50-59) · provisional rating

Also seen as: Do, Duc

Ratings

Athlete ratings by board
BoardGenderRatingRankMove
ContinuousMen740799• new
OverallMen740798• 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)

Arizona Monster 300 · Apr 4, 2025 · 304mi continuouscounts toward rating
place 124 · 5d 23:50:24 · difficulty 2.20 · field 2.26 · quality 0.40
1,996
Unreasonable East 200 Miler · Aug 20, 2024 · 200mi continuouscounts toward rating
place 11 · 4d 00:26:43 · difficulty 1.00 · field 0.69 · quality 0.44
303
Irrational S.O.U.T.H. 200 Miler · May 8, 2024 · 200mi continuouscounts toward rating
place 20 · 4d 00:12:50 · difficulty 1.00 · field 0.68 · quality 0.40
272
(race) · · ?mi
place 93 · · 14 yards · difficulty ? · field ? · quality 0.15
12