[2] He played college basketball for the UCLA Bruins, where he was a four-year starter and named all-conference as a senior in the Pac-10 (now known as the Pac-12).

In his senior year of high school he averaged 23.4 points, 8.3 assists and 14 rebounds per game.

[3] Watson was a starter in college at UCLA, at one point playing alongside future NBA All-Star Baron Davis.

A four-year starter, Watson started the most consecutive games in the history of UCLA basketball.

[4] It was Seattle's first triple-double since Ray Allen registered one on January 28, 2004, against the Los Angeles Lakers.

On October 2, 2014, Watson was hired as an assistant coach by the Austin Spurs of the NBA D-League, effectively ending his 13-year playing career.

[12] While Watson would make his coaching debut on February 2, 2016, at home against the Toronto Raptors, it wouldn't be until February 27, almost a month later, where he'd record his first win with the Suns at home against the Memphis Grizzlies, a team he had previously played under.

[15][16] Before the start of the 2017–18 season, Suns owner Robert Sarver had told sports agent Rich Paul of Klutch Sports, who represented Watson at the time, that he planned to fire Watson if the coach did not sever ties with Klutch.

[17] After the Suns got off to a 0–3 start, with two blowout losses (including the worst loss in franchise history and worst season opening performance in NBA history), Watson was fired on October 22,[18] and replaced on an interim basis by associate head coach Jay Triano for the rest of the season.

[14] One of his brothers, Dwayne, was a retired police officer who died due to blood clots in his legs that were dislodged during an altercation.

In September 2018, Watson and Fox Sports 1 personality Joy Taylor announced that they were engaged.

[30] Watson has stated he takes coaching inspiration from UCLA all-time great John Wooden.