Californian prop Mason Pedersen played in Major League Rugby between 2018-2026. He represented the Austin Gilgronis (2018-2019, 2021-2022) and the Seattle Seawolves (2020, 2023-2026).

Mason Pedersen was raised in Long Beach, CA and attended Woodrow Wilson High School before enrolling at the University of Arizona from 2014. Following his graduation, he joined the Austin Huns in 2017 where he helped the team to a D1 Championship before signing with the Austin Elite for Major League Rugby’s inaugural season in 2018 where he earned 5 starts in 6 games. Following the season he played with the Vancouver Rowing Club in British Columbia before returning to the Elite for the 2019 season where he scored his first MLR try. After a breif spell with the Seattle Seawolves for the truncated 2020 season where he scored 2 tries in 5 games (starting 4), Pedersen returned to Austin with the new look Gilgronis for two seasons from 2021-2022. In total, Pedersen earned 29 starts in 43 games for Austin, scoring 3 tries in total and completing a career high 89 tackles in 2022.

Following the disqualification of the Austin Gilgronis from the 2022 season and their subsequent cessation of operations, Pedersen re-joined the Seattle Seawolves for 2023, and earned 3 starts in 17 games in his first full season in the Pacific Northwest. He picked up an injury which ruled him out of the following season, but on January 14th, 2025, Mason Pedersen was included on the Seattle Seawolves roster for their 2025 season, his 8th in MLR. He bounced back in 2025, earning 2 starts and completing 84 tackles in 15 games, as well as passing 1000m gained in his 80 game career and earning his first career Team of the Week selection in Rd 10. Pedersen would return for a 5th season with the Seattle Seawolves in 2026, as the team announced his return on 19th December, 2025.

achievements

• MLR Team of the Week: 2025 – Rd 10
• 2024 MLR Runner-Up: Seattle Seawolves