John Mayfield

Career: 36.59 percentile of ICSA crews

Includes linked high school and college seasons.

▲ boats did better with this crew than with the skipper's usual crews▼ worseArrow length = size of the push, in rating points

Season	Team	Rating	League percentile	Team percentile	On team	Races	Team page
Spring 2026	University of California at Berkeley	-0.21	22.78	31.82	8 of 11	10	Team page
Spring 2025	University of California at Berkeley	0.25	27.31	43.33	9 of 15	14	Team page
Fall 2024	University of California at Berkeley	0.31	28.67	42.31	8 of 13	16	Team page

Regatta	Role	Div	Races	Avg	Rating
Spring 2023 Team page Season
PCISA Gaucho Regatta - Silver	Skipper	B	4	25.2	-1.96
Fall 2022 Team page Season
2022 PCISA Anteater Regatta - Gold Fleet	Skipper	B	5	30.6	-2.95
Spring 2022 Team page Season
PCISA Gold PCC's	Crew	A	20	15.4	—
PCISA Gaucho Regatta - Gold	Crew	A	7	15.1	—
Fall 2021 Team page Season
GOLD - Rose Bowl 2022	Crew	A	8	22.5	—
2021 Sea Otter GOLD	Crew	A	8	9.0	—

League	Name	School	Year
ICSA	John Mayfield	University of California at Berkeley	'28

Short write-ups of what the ratings and results show, with the numbers and how they were computed.

How do skipper ratings work?A log-strength fitted to every race at once, smoothed week to week.
What a rating point is worthA one-point edge is a 73% chance to beat another boat in a race; two points is 88%.
How does a crew rating work?A crew rating is small and uncertain; a worked example on one roster.