Marquez was the 44th selection in the 2014 MLS SuperDraft. For the 2014 season, he was loaned to the Harrisburg City Islanders of USL Pro. While there, he played an integral role in leading Harrisburg to the USL PRO championship game. He led USL PRO in minutes played (2,520) by playing the full 90 minutes in 28 games.
Marquez played his MLS debut on May 2, 2015, coming on as a fifth-minute substitute in a 1–0 loss against Toronto FC. He has since earned a starting role in the Union line-up. He scored his first goal with the Union on July 14 against the English Premier League newcomers AFC Bournemouth in the 36th minute of the match.
On September 13, 2019, Marquez was sworn is as a member of the Bensalem (Pennsylvania) Police Department.