2015 was a history-making year for the Redhawks as Fewing led the team to their first ever Division I Sweet 16 appearance (at Syracuse) with a win vs. No. 25 UCLA in the Second Round. Also a first, Seattle U hosted their first ever Division I NCAA game on campus in the defeat of the Bruins. Seattle U was ranked in the NSCAA Top 25 for eight straight weeks, from the end of September through the end of the final regular season poll and Fewing was named NSCAA West Regional Coach of the Year. The Redhawks earned wins vs. No. 10 Washington and No. 13 Oregon State, most notably, as well as versus the Ivy League's Harvard and Dartmouth, earning 10 shutouts over the season.
In 2014, Fewing coached the Redhawks to their second straight WAC tournament appearance in as many seasons in the conference, which the Redhawks hosted on their home field. Individually, Ian Hines-Ike was named First Team All-Region while Hamza Haddadi and Kyle Bjornethun were named to the Second Team by the NSCAA. Academically, Fewing led the Redhawks to the program's first NSCAA Team Academic Award in the Division I era for posting over a 3.0 cumulative GPA for the 2013-14 school year.
The 2013 season was one for the record books as he was named Western Athletic Conference Coach of the Year, taking the Redhawks from an 0-6-1 start to winning both the WAC Regular Season and Tournament titles. With the Tournament win, the team became Seattle U's first men's team to qualify for an NCAA DI tournament since March 1969 and the first to win an NCAA DI tournament game since March 1964 with a 2-1 come-from-behind win at Creighton on Nov. 21 in the First Round. He helped develop both senior forward Miguel Gonzalez, named WAC Offensive Player of the Year, and senior goalkeeper Jake Feener, who led the nation in DI saves and saves per game throughout the entire 2013 season.
In his first year back as head coach of the Redhawks, the team played in the MPSF conference, as well as taking on strong opponents such as Portland, Gonzaga, UW, and nationally-ranked UC Santa Barbara and New Mexico. Marshall Kosaka earned Second team All-MPSF honors, and Jose Merlo wasrecognized for honorable mention all-conference. Six members of the team received MPSF All-Academic Honors, a testament to Fewing's emphasis on academics along with athletics.
Fewing was the head coach of the Seattle University men's soccer team from 1988 through the 2005 season, when he accumulated a record of 220-125-26 (.628) during his 18 seasons at the helm. He led Seattle U to the 1997 NAIA National Championship and the 2004 NCAA Division II National Championship.
Fewing was the head coach of the Kitsap Pumas of the Professional Development League (PDL) in 2010 and 2011, helping the Pumas win the 2011 PDL National Championship. He co-authored the book Coaching Principles for Development of Championship Teams, and he has been an analyst during the television broadcasts of Seattle Sounders FC matches.