The 2019-20 shortened-season was Ferrell's fourth in the Association and his second with the Kings. The quick guard played in 44 of a possible 64 games for Sacramento and averaged 11.0 minutes per contest. The 26-year-old delivered per-game averages of 4.2 points, 1.3 assists, 1.1 rebounds, 0.4 three-pointers and 0.3 steals. In four different games, Ferrell dished a season-high four assists. On Dec. 2, over 20 minutes of run, Ferrell posted nine points, four assists, two steals and one three-pointer during a home loss to the Bulls. On Dec. 26, Ferrell scored a season-high 17 points, with three assists, during a 1-point loss at San Antonio. On Jan. 15, the Indiana product drained a season high three three-pointers during at home versus the Mavericks. For the season, Ferrell scored in double-digits three times and had 16 games with at least one made three-pointer. He had 14 games with at least two assists. He also shot an impressive 86.5 percent from the charity stripe.

The 2018-19 campaign was Ferrell's first season in Sacramento, and he averaged 15.0 points, 1.9 assists, and 1.5 rebounds in 71 games (three starts) for the Kings. He began the season with a 12-point outing against the Jazz. He scored his 1,500 career point on January 14 against Portland. The third-year pro shot 43.5 percent from the field, including 48.8 percent from two-point range -- both career highs. Those numbers included several standout performances. He scored 17 points and added six assists in a 141-130 win against Minnesota on Dec. 12. He made all four of his three-point attempts in that game, while shooting 5-for-6 from the field. The 25-year-old scored a season-best 19 points in a 127-112 win against San Antonio on Feb. 4. He recorded a season-high six assists and seven rebounds against Toronto on Jan. 22 in a game where he also scored 10 points. Also of note is that Ferrell finished the year with a career-best .896 free throw percentage.

Ferrell enjoyed a productive campaign in his first full season in Dallas. The former Indiana Hooiser played in all 82 games for the Mavericks and made 21 starts. He set new career highs with 27.8 minutes and 10.2 points per contest. Ferrell also set a career high with 3.0 rebounds per game and chipped in 2.5 assists per night. Not surprisingly, he upped those averages as a starter. In his 21 starts, Ferrell averaged 33.3 minutes, 12.0 points, 3.9 rebounds and 2.9 assists per contest. He scored a season-high 24 points in a start against Denver on Mar. 6. Ferrell made 6-of-7 from 3-point range in that contest, and for the season, he shot 37.3 percent from deep on a career-high 4.4 attempts per game. Ferrell had 17 games in which he scored 15 points or more. He had a season-high 12 assists in a game against his former team, the Brooklyn Nets, on Mar. 17. Ferrell also scored 12 points in that contest for one of his three double-doubles on the season.

Ferrell was undrafted in the 2016 NBA Draft, but joined the Brooklyn Nets for Summer League and preseason action. On Nov. 1, the speedy point guard joined the D-League Long Island Nets, but rejoined Brooklyn on Nov. 9. That night he made his NBA debut and posted five points, three assists, one rebound and one steal over 14 minutes of run. From Nov. 9 to Dec. 1, the Indiana product played in 10 of the Nets' 11 games and averaged 5.4 points, 1.7 assists, 1.2 rebounds and 0.8 three-pointers in 15.1 minutes per game. In fact, on Dec. 1, the rookie appeared in both a Brooklyn Nets game (3 minutes) and a D-League Nets game (38 minutes) at the Barclay's Center. Ferrell stayed with Long Island and appeared in 18 December and January D-League games. Over that span, he averaged 18.7 points, 5.8 assists, 2.9 rebounds, 2.7 three-pointers and 1.6 steals per D-League contest. On Jan. 28, Ferrell signed a 10-day contract with the Dallas Mavericks. The next night he made his Mavs debut during a win at San Antonio and delivered nine points, seven dimes and two steals. Ferrell then started six of Dallas' next eight games and impressed management with 16.0 points, 4.5 assists and 2.5 three-pointers per contest. On Feb. 7, the rookie signed a two-year agreement with Dallas. Ferrell wound up playing in Dallas' last 36 games, with 29 starts, and generated 11.3 points, 4.3 assists, 1.7 three-pointers and 1.1 steals over 29.0 minutes per NBA contest.