Competitive peak
USBC bowler profile
Marshall Mastenbrock
League Competitor
8970-199270
Bowling since 2021
180+ peak
160+ career avg
100 games
Lifetime average
168.25
Lifetime games
186
Highest average
181
Career honors
0
What this profile flair means
Competitive peak aura
The nameplate aura reflects a highest recorded league average of 181.
League Competitor
The starting title for a bowler with recorded league history.
Honor pins
Pins appear after a recognized 300 game, 800 or 900 series, or 11-in-a-row award.
Milestone marks
These celebrate peak average, career average, recorded games, and accumulated honors separately.
Historical records
League History
USBC records begin in 2021. Sport and challenge conversions are summarized below.
Recent composite averages
Year2026
Type
House
Average171
Games147
Year2025
Type
House
Average158
Games36
Year2021
Type
House
Average167
Games3
League averages
2026-2027
League
Tuesday Shooters
SeasonW
Average & games
2025-2026
League
Valentine Funtime 3
SeasonS
Average & games
League
Summer Tuesday Shooters
SeasonS
Average181
Games45
League
Tuesday Shooters
SeasonW
Average167
Games102
2024-2025
League
Summer Tuesday Shooters
SeasonS
Average158
Games36
Show earlier league averages Hide earlier league averages
2020-2021
League
Sunday Shooters
SeasonS
Average167
Games3
USBC standing
Memberships
AssociationContra Costa County USBC
StatusCurrent
From2026-08-01
Through2027-07-31
AssociationContra Costa County USBC
StatusPast
From2025-08-01
Through2026-07-31
AssociationContra Costa County USBC
StatusPast
From2024-08-01
Through2025-07-31
AssociationContra Costa County USBC
StatusPast
From2024-08-01
Through2025-07-31
AssociationContra Costa County USBC
StatusPast
From2020-08-01
Through2021-07-31
Career milestones
Honors
0900 series
0800 series
0300 games
011 in a row
Tournament history
Open Championships
Adjusted entering average
157
How it was calculated
The highest sport-adjusted average from the last three bowling seasons is used until 27 Open Championship games are available.
2025/26181 → 157
Your Open Championships average is calculated from your 27 most recent games bowled between 2018 and 2026.
Search historical Open Championships scores.