[2] He repeated in 2016, earning organizational Minor League Player of the Year honors with a combined .289 batting average and 13 home runs with the High–A Potomac Nationals and the Double–A Harrisburg Senators.

He capped off his day by hitting a two-out, go-ahead grand slam in the ninth inning, and the Senators won the ballgame 14–13.

[13] On November 27, 2019, Marmolejos signed a minor league contract with the Seattle Mariners, that included an invitation to spring training.

[14] On July 24, 2020, Marmolejos made his MLB debut on Opening Day, going hitless over 3 at-bats against the Houston Astros.

[17] After having a great stint with Triple-A Tacoma, hitting .360 with 23 home runs and 71 RBI's through 72 games, his contract was re-selected by the Mariners on August 30, 2021.

On April 29, 2023, Marmolejos signed with the Spire City Ghost Hounds of the Atlantic League of Professional Baseball.