[4] MacMath attended the University of Maryland, where he was first choice goalkeeper for three seasons, winning a national title and numerous individual awards along the way.

[12] On December 9, 2018, MacMath was traded to Vancouver Whitecaps FC in exchange for Nicolás Mezquida and $100,000 in Targeted Allocation Money (TAM).

[13] On December 17, 2019, Real Salt Lake acquired MacMath from Vancouver in exchange for $50,000 in TAM in 2020.

[2] MacMath led the U.S. U-20 men's national team to the Milk Cup title, posting a strong performance that helped defeat host Northern Ireland, 3–0, at the Showgrounds in Ballymena, on July 30, 2010.

[15] MacMath along with Union teammate Amobi Okugo were called up to the U-20 squad for the CONCACAF U-20 Championship in March–April.