Freshman year As a freshman, Williams-Goss started every game, while averaging 13.4 points, 4.4 assists, 4.4 rebounds, and 1.1 steals. His stellar season earned him a selection to the All-
Pac-12 Freshman Team. He led the Pac-12 conference freshmen in scoring, assists, and assist-to-turnover ratio (1.6). He set a new UW freshman single-season record with 140 assists. Despite his phenomenal year, UW finished with a disappointing 17–15 record (9–9 in Pac-12 games), losing in the first round of the Pac-12 Tournament to Utah, and missed the postseason for the first time since 2007, after declining an invitation to the CBI. In his first collegiate game, he posted 6 points, 6 assists, 3 rebounds, 3 steals, and a season-best 1 block on 2-for-7 field goal shooting and 2-for-2 from the free throw line in an 88–78 win over inner-city rival Seattle University. On November 17, he had 22 points, 6 rebounds, 5 assists, and a season-high 3 steals on 9-for-15 from the field and 4-for-5 from the charity stripe in a 92–80 win over Eastern Washington. On November 26, he scored 20 points, along with 6 assists and 3 assists on 5-of-8 2-point shooting, 1-of-1 from 3-point, and 7-of-8 free throws in an 83–79 win over Montana. On January 18, 2014, Williams-Goss posted 17 points, 7 rebounds, 6 assists, and 1 steal on 3-for-7 2-pointers, 3-for-5 from 3-point land, and 2-for-3 free throws in a 79–67 loss to Stanford. On January 25, he set a new UW freshman single-game scoring record with 32 points in come-from-behind 87–81 win over Oregon State, in which he shot 7-for-11 from 2-point range, a season-best 3-for-4 from beyond the 3-point line, 9-for-10 from the free throw line, along with 5 rebounds, 3 assists, 1 steal, and zero turnovers. On February 22, Williams-Goss dished out a season-high 10 assists to go along with 14 points, 2 rebounds, and 1 steal on 7-for-10 field goal shooting in an 86–62 win over Oregon State. On February 28, he grabbed a season-high 12 rebounds, along with 17 points, 4 assists, and 2 steals on 6-of-10 2-point field goals, 1-of-2 3-pointers, and 2-of-3 free throws om 30 minutes, in a 72–49 win over cross-state rival Washington State.
Sophomore year As a sophomore, he led the
2014–15 Huskies in points (15.6 scoring average) and assists (5.9 per game). He also contributed 4.7 rebounds and 1.1 steals per game, while starting in 30 of the team's 31 games. He was also named as a third-team
Academic All-American, while boasting a 3.74 cumulative GPA in pre-social science. Washington began the year with an 11–0 record, including impressive wins over Oklahoma and San Diego State, matching the best start in Lorenzo Romar's tenure as the Huskies' coach. Despite such a promising start, Washington would lose 15 of its last 20 games, finishing with a 16–15 record (5–13 in Pac-12 games), losing in the first round of the Pac-12 Tournament to Stanford, and missed the postseason yet again, after declining an invitation to the CBI. In his first game as a sophomore at Washington on November 14, 2014, Williams-Goss grabbed a career-high 12 rebounds, along with 10 points, 7 assists, 2 steals, and 1 block on 5-of-5 2-point shooting in a 77–59 win over South Carolina State. On November 28, he dished out a career-high 12 assists to go along with 21 points and 7 rebounds on 6-for-14 field goals and 5-for-6 free throws in an 80–70 win over Long Beach State. On January 2, 2015, in an 81–75 loss to Cal, Williams-Goss came the closest to a triple-double in his college career, posting 19 points, 9 assists, and 8 rebounds on 7-for-16 from the field and 5-for-6 from the free throw line. In an 80–77 loss to Washington State on January 10, Williams-Goss dropped 30 points, 7 rebounds, 5 assists, and career-highs of 3 steals and 1 block on 13-for-22 field goals and 4-of-4 from the charity stripe. In a loss to Cal on February 1, he posted a season-high 31 points along with 6 rebounds, 5 assists, 1 steal, and zero turnovers on 8-of-11 2-pointers, 3-for-6 3-point field goals, and 6-of-6 free throws. On February 15, he had 20 points, 6 assists, and 5 rebounds on 6-of-15 within the arc, 1-of-3 beyond the 3-point arc, field goals and 5-of-5 free throws in a loss to Arizona State. In a win over Washington State on February 22, he had 20 points, 7 assists, 3 rebounds, and 2 steals on 6-of-10 2-pointers, 1-for-3 from 3-point land, and 5-of-8 free throws. In the regular season finale against Utah on March 7, Williams-Goss posted 28 points, 6 rebounds, 3 assists, and 2 steals on 10-for-16 2-point field goals, 1-of-2 3-pointers, and 5-for-7 free throws in a 77–68 win over #13 Utah.
Junior year In April 2015, Williams-Goss announced he was leaving Washington and transferring to another school. Even though he had a great relationship with Coach Romar and his teammates, he was uncomfortable with the changes surrounding the program and the team's consistent losing. He initially claimed he was considering UNLV, Texas, Georgetown, Michigan State, Arkansas, and Gonzaga. A couple days later, he said he would take visits to UNLV, Providence, Texas, and Georgetown, with Michigan State also in the mix. After visiting UNLV and Providence, Williams-Goss cut his list to 4 (UNLV, Providence, Gonzaga, and Ohio State), with plans to visit Gonzaga and Ohio State. He called off his trip to Ohio State after committing to Gonzaga during his recruiting trip. He would have to redshirt the 2015–16 season before having two years of eligibility to play at the beginning of the 2016–17 season. Williams-Goss cited the Zags' track record of developing players during their redshirt year, winning at a high level, and their up-tempo offense which includes a ton of ball screens for his commitment to Gonzaga. Throughout his junior season, Williams-Goss provided his best season in college with his only season in Gonzaga. In 38 games he played with for Gonzaga, he recorded the most points off of his best overall shooting percentage, rebounds, and steals per game while also playing the fewest minutes per game throughout his college career. In addition to those results, he was also named the
West Coast Conference's Newcomer of The Year and the
West Coast Conference's Player of The Year, as well as became a member of the All-West Coast Conference First Team, a member of the
Academic All-American First Team, and was a consensus All-American Second Team for the help he provided for the 37–2 Gonzaga Bulldogs. Not only that, but he also helped lead Gonzaga to its first ever NCAA Championship match, where they ultimately lost to the
North Carolina Tar Heels. After the end of the NCAA Tournament, Williams-Goss was one of a record-high 182 underclassmen to declare for the
2017 NBA draft, with him signing up with an agent on the day of his declaration. ==Professional career==