In 2011, Watson stated his professional career as a player-coach with
Körfuknattleiksfélag ÍA of the Icelandic
1. deild karla. In 22 games played for ÍA, he averaged 24.4 points and league leading 15.1 rebounds. On January 2, 2013, Watson joined 1. deild karla club
Haukar. In 10 games played for Haukar, he averaged 22.3 points and 12.1 rebounds. Watson helped the team to promote to the top-tier
Dominos League as the
1. deild karla regular season champions. On March 28, 2014, Watson recorded a career-high 33 points, shooting 14-of-21 from the field, along with 11 rebounds and three blocks in a 77–81 loss to
Njarðvík in the third and decisive game of the Úrvalsdeild first round playoffs series. In his second season with Haukar, he led the league with 14.9 rebounds and 3.2 blocks while also averaging 24.1 points, 2.1 assists and 2.1 steals per game. In October 2014, Watson joined
Maccabi Kiryat Gat of the
Israeli National League. In 35 games played for Kiryat Gat, he averaged 16.8 points, 11.5 rebounds and 2.1 rebounds per game, leading Kiryat Gat to win the Israeli National League championship after they defeated
Ironi Kiryat Ata 3–2 in a best of five series. On October 23, 2015, Watson signed with the
Helsinki Seagulls of the Finnish
Korisliiga. Watson helped the Seagulls to reach the
2016 Korisliiga Playoffs as the seventh seed, but they eventually lost to
Tampereen Pyrintö in the Semifinals. On August 10, 2016, Watson returned to Israel for a second stint, signing with
Hapoel Kfar Saba for the 2016–17 season. In 32 games played for Kfar Saba, he averaged 16 points and 10.7 rebounds per game. Watson helped Kfar Saba to reach the Liga Leumit Playoffs as the second seed, but they were eliminated by
Hapoel Be'er Sheva in the Semifinals. On September 11, 2017, Watson signed with
San Miguel Beermen of the
Philippine Basketball Association (PBA). On November 15, 2017, Watson joined
Maccabi Ashdod of the
Israeli Premier League, signing a two-month contract as an injury cover for
Gerald Lee. On October 1, 2018, Watson returned to the Philippines for a second stint, signing with the
Rain or Shine Elasto Painters as a replacement for
J'Nathan Bullock. In seven games played for the Painters, he averaged 16 points, 11.7 rebounds and 3.3 blocks per game. On March 7, 2019, Watson returned to Israel for a fourth stint, signing with
Hapoel Be'er Sheva. However, on March 18, 2019, Watson suffered an achilles injury in his second game with Be'er Sheva and ruled out for the rest of the season. ==Awards, titles and accomplishments==