On September 24, 2020, Grimes signed his first professional contract with
Kobrat of the
Korisliiga. He averaged 16.7 points, 12.6 rebounds and 1.7 assists per game. On June 30, 2021, Grimes signed with
Kangoeroes Basket Mechelen of the
BNXT League. He averaged 18.0 points, 11.9 rebounds, 1.4 steals, and 1.0 block per game in eight games. On February 19, 2022, Grimes signed with
BG Göttingen of the
Basketball Bundesliga. In 16 games he averaged 6.1 points, 5.2 rebounds, 0.5 blocks, and 16.5 minutes per game. On August 4, 2022, he signed with
Hapoel Eilat of the
Israeli Basketball Premier League. Grimes joined
Sigal Prishtina of the
Kosovo Basketball League on February 6, 2023. On July 10, 2023, Grimes signed with
Iwate Big Bulls of the Japanese
B.League. On November 17, his contract was terminated. On July 22, 2024, Grimes signed with the
Assigeco Piacenza of the
Serie A2. On January 16, 2025, his contract was terminated. On March 9, he signed with the
Borneo Hornbills of the
Indonesian Basketball League (IBL), replacing
Devondrick Walker. ==References==