Xavier Andrew Rathan-Mayes (born April 29, 1994)[1] is a Canadian professional basketball player for Real Madrid of the Spanish Liga ACB and the EuroLeague.

Born in Markham, Ontario, he started playing high school basketball at Christian Faith Center Academy in North Carolina.

[15] On April 22, 2019, he recorded a season-high 28 points, shooting 6-of-11 from three-point range, along with five rebounds and three assists in a 76–72 win over Ironi Nahariya.

[16] In July and August 2019, Rathan-Mayes played with the Hamilton Honey Badgers of the Canadian Elite Basketball League (CEBL).

He helped the team reach the final of the 2019 season, scoring 24 points in a loss to the Saskatchewan Rattlers.

[22] In his debut for United on October 2, 2022, he recorded 33 points, nine rebounds, and five assists in a 101–97 overtime win over the New Zealand Breakers.

[24] Rathan-Mayes spent the 2023-2024 campaign with Russian club BC Enisey, averaging a career-high of 25.4 points, 4.2 rebounds and 4.5 assists per game.

On July 12, 2024, Rathan-Mayes signed a two-year contract with Spanish powerhouse Real Madrid, moving to the EuroLeague for the first time in his career.