Born in Philadelphia and raised in Glenside, Pennsylvania to Grant and Elizabeth Evans, Maddy attended Abington Senior High School where she played four varsity sports, Cross Country, Track, Soccer, and Lacrosse. Named to the Southeastern Pennsylvania Coaches' All-Star Team, All-Suburban One Second Team. As of 2016, holds the 800-meter and one mile run records. During her junior and senior years, she opted to play varsity lacrosse. Evans was ranked 41st in the ESPN Rise Girls' Soccer Top 50 Rankings. Evans was a seven-year member of the club team, FC Bucks Vipers and helped lead the team to its first ever U.S. Youth Championship in 2009. She was named the Golden Boot winner after scoring five goals at the Nationals, including the game-winning goal during the championship game. With the team, she won seven Eastern Pennsylvania State Cups, a Region IPremier League Championship, and two Region I Championships. She was also a seven-year member of the Eastern Pennsylvania and Region I Olympic Development Program teams, with whom she competed internationally. She was named MVP of the 2009 Kuban Spring Tournament in Russia and captained the 2008 Pennsylvania ODP team that won the Region I Championship.
Evans attended Pennsylvania State University and played for the Nittany Lions from 2009 to 2012. During her senior year, she served as the team captain and played a pivotal role in leading the Nittany Lions to the College Cup Final. Evans finished her collegiate career with 11 goals, 9 assists, and 31 points. She was named a 2012 All-Big Ten Second Team selection. She made the Penn State record books on August 26, 2011, when she scored the second fastest goal in the program's history. She scored within the first 62 seconds of a winning match against West Virginia. During the game, she also tallied one assist.
Club career
Boston Breakers, 2013–2015
In 2013, Evans was selected by the Boston Breakers during the fourth round of the 2013 NWSL College Draft. Not signed initially after training camp, she was called up as an amateur player when international players were called up to their national teams in late May. She played three seasons in Boston, making 46 appearances, including 23 starts.
Orlando Pride, 2016–2017
In November 2015, Evans was selected by Orlando Pride in the NWSL Expansion Draft.