Merrill attended Davis High School, playing club soccer with La Roca from under-10 to under-17 and a further year with Sparta United SC.
[3] Whilst at college, Merrill also appeared in the USL League Two with Salt City SC in both 2021 and 2022, scoring two goals in ten games.
[4][5][1] On 27 January 2023, Merrill signed his first professional contract, joining USL Championship side Hartford Athletic after impressing in a club combine.
[8] On April 5, 2023, Merrill helped Hartford to the second round of the Lamar Hunt US Open Cup after they defeated amateur side Lansdowne Yonkers 3–0.
[9] Following a stint back with Salt City SC during their 2024 season,[10] Merrill signed with USL League One side Spokane Velocity on October 2, 2024.