Siaosi Mariner Bio
George Siaosi Mariner is an American professional football wide receiver who most recently played for the Saskatchewan Roughriders of the Canadian Football League (CFL). Standing 6 ft 2 in (1.88 m) and weighing 190 lb (86 kg), he has built his career through stops in the National Football League (NFL), the United Football League (UFL), and the CFL. A 2025 Grey Cup champion, Mariner is also recognized as the UFL receiving yards leader for the 2025 season. His journey from a multi-sport high school athlete in Tustin, California, to a professional champion reflects steady development across multiple football leagues.
Born and raised in Orange County, Mariner developed into a versatile receiver through his college years at the University of Utah and Utah State University. After going undrafted in the 2020 NFL Draft, he accepted invitation-only opportunities with the Las Vegas Raiders and Baltimore Ravens before making his professional mark in the CFL and UFL. His 2025 campaign stands as his most decorated, capped by a championship and individual statistical honors.
Early Life and Background
George Siaosi Mariner was born on January 25, 1997, in Tustin, California. He grew up in the same community where he would later build the foundation of his athletic career. Tustin, located in Orange County, provided a competitive amateur sports environment that shaped his early development as an athlete.
Mariner attended Tustin High School, where he lettered in both football and basketball. On the football field, he lined up at both cornerback and wide receiver, demonstrating the kind of two-way athleticism that scouts often prize. His play on the defensive side of the ball in 2014 earned him second-team MaxPreps all-state honors at cornerback, an early indication that he could compete at a high level on both sides of the ball. Playing basketball alongside football also helped him develop the footwork, body control, and court awareness that later translated to his route running and contested catches as a receiver.
The combination of size, speed, and multi-sport background made Mariner an attractive college prospect, and he ultimately chose to pursue football at the next level rather than focus solely on one sport during his developmental years.
Path to Professional Football
Mariner began his college career at the University of Utah, where he joined the Utes in 2015 as a redshirt. After sitting out his first year to preserve a season of eligibility, he began his on-field work as a wide receiver in 2016. Over three seasons with the Utes from 2016 through 2018, he appeared in 36 games with 22 starts, gradually increasing his role within the offense.
Looking for a larger opportunity, Mariner transferred to Utah State University for the 2019 season. The move paid off. He started all 13 games for the Aggies and produced 63 receptions for 987 yards and 10 touchdowns, averaging more than 15 yards per catch. That production earned him second-team All-Mountain West Conference honors, validating his decision to change programs. The 2019 campaign positioned him as a legitimate professional prospect heading into the 2020 NFL Draft cycle.
Despite his strong senior season, Mariner went undrafted in the 2020 NFL Draft. Rather than give up on his professional ambitions, he pursued the traditional path of signing with a team as an undrafted free agent, beginning the next phase of his football journey in the NFL.
Siaosi Mariner Career
Early Career (2020-2021)
Mariner signed with the Las Vegas Raiders of the NFL on May 7, 2020, just after the conclusion of that year’s draft. The opportunity offered him a chance to compete for a roster spot in a crowded wide receiver room. However, the Raiders released him on July 31, 2020, ending his first NFL stint before the regular season began.
He remained in pursuit of an NFL roster spot and was signed by the Baltimore Ravens on August 9, 2021. Mariner spent the 2021 preseason with the Ravens, but he was released on August 30, 2021, ahead of final roster cuts. Although his time in the NFL was brief, the experiences with the Raiders and Ravens gave him valuable insight into the speed and complexity of the professional game, preparing him for opportunities north of the border and in spring football.
CFL Breakthrough with the Ottawa Redblacks (2022-2023)
Mariner signed with the Ottawa Redblacks of the CFL on January 21, 2022, marking his first long-term professional home. After spending time on the practice roster during the early part of the season, he was promoted to the active roster on October 13, 2022. He went on to appear in three games, all starts, finishing the year with eight receptions for 98 yards and one touchdown.
In 2023, Mariner returned to the Redblacks and dressed in 13 games, starting nine. He recorded 18 receptions for 219 yards and one touchdown, demonstrating greater consistency as a possession receiver. Although he moved between the active roster and the single-game injury list at times during the season, his role within the offense grew. Following the 2023 campaign, Mariner became a free agent and began exploring opportunities outside of the CFL.
UFL Stint with the Michigan Panthers (2024-2025)
On April 4, 2024, Mariner signed with the Michigan Panthers of the United Football League, the spring football league that grew out of the merger of the XFL and USFL. He re-signed with the Panthers on August 13, 2024, after his initial deal expired, signaling mutual commitment between the player and the franchise. In the UFL, he found a consistent role as a starting wide receiver.
His 2025 UFL season proved to be a breakout. On April 26, 2025, Mariner recorded his first 100-yard receiving game, catching six passes for 111 yards against the St. Louis Battlehawks. He went on to lead the UFL in receiving yards for the 2025 season, the statistical highlight of his professional resume to that point. That performance helped establish him as a proven playmaker at the professional level.
Saskatchewan Roughriders Era (2025-Present)
Mariner joined the Saskatchewan Roughriders of the CFL on October 21, 2025, returning to the Canadian game late in the season. He spent the remainder of the 2025 campaign on the Roughriders’ practice roster, remaining with the organization through the playoffs. His timing coincided with one of the most successful stretches in Roughriders history.
On January 2, 2026, Mariner signed a contract extension with Saskatchewan, cementing his place on the roster for the future. The Roughriders later made a final round of roster cuts on May 30, 2026, ahead of the 2026 season, and Mariner was among those released. Throughout the 2025 season with Saskatchewan, his CFL regular-season totals stood at 26 receptions for 317 yards and two touchdowns, reflecting the production he delivered while wearing Roughriders colors.
Notable Events and Milestones
Mariner’s most significant career milestone came in 2025, when he helped the Saskatchewan Roughriders capture the Grey Cup, the championship of Canadian professional football. That same year, he was recognized as the UFL receiving yards leader, a rare combination of team success and individual statistical achievement in a single season. Earlier in his career, his 2019 second-team All-Mountain West Conference selection at Utah State marked the moment he first drew league-wide attention. His first 100-yard UFL game against the St. Louis Battlehawks on April 26, 2025, also stands as a defining performance that foreshadowed his championship run later that year.
Siaosi Mariner Career Wins
Although statistics on reception totals vary across his career stops, Mariner’s most celebrated win remains the 2025 Grey Cup championship earned as a member of the Saskatchewan Roughriders. The title is the defining team accomplishment of his professional career, achieved in his first season with the franchise.
CFL and UFL Highlights
Across his CFL career, Mariner has posted 26 receptions for 317 yards and two touchdowns, with the bulk of that production coming in 2025. He has also registered 18 receptions for 219 yards and one touchdown during the 2023 CFL season with the Ottawa Redblacks, marking his first extended stretch of consistent playing time. In the UFL, he finished 2025 as the league’s receiving yards leader, a testament to his role as a primary target in the Michigan Panthers’ offense.
Siaosi Mariner Family
Personal Life
Public information about Mariner’s personal life is limited. He was born and raised in Tustin, California, and is American by nationality. Beyond these basic biographical details, further verified information about his family and relationships is not widely available.
2025 Season Performance
The 2025 season was a career-defining year for George Siaosi Mariner. He began the year with the Michigan Panthers of the UFL, where he emerged as a leading receiver and ultimately led the league in receiving yards. His first 100-yard game came against the St. Louis Battlehawks on April 26, 2025, a performance that established him as a primary offensive weapon for the Panthers.
Later in the year, Mariner signed with the Saskatchewan Roughriders on October 21, 2025, returning to the CFL in time for the stretch run of the season. Although he spent the final weeks primarily on the practice roster, he remained part of the organization as the Roughriders pushed through the playoffs.
Saskatchewan’s run concluded with a Grey Cup victory, giving Mariner his first professional championship. The combination of his UFL statistical title and his Grey Cup ring in the same calendar year made 2025 the most accomplished season of his career. Following the championship, he signed a contract extension with the Roughriders on January 2, 2026, before being released in the final round of cuts ahead of the 2026 season on May 30, 2026.