[1] Harrison made her WTA Tour main-draw debut at the 2011 Cellular South Cup, after receiving a wildcard for the singles competition.

[citation needed] Harrison won her first doubles title at the Monterrey Open, partnering compatriot Sabrina Santamaria and defeating Han Xinyun and Yana Sizikova in the final.

[citation needed] Harrison qualified to make her singles debut at the Wimbledon,[3][4] defeating Arantxa Rus in the first round[5] then losing her next match to Ajla Tomljanovic.

[6] She also qualified for the main draw at the US Open, losing to sixth seed Aryna Sabalenka in the first round.

[7] Only main-draw results in WTA Tour, Grand Slam tournaments, Billie Jean King Cup and Olympic Games are included in win–loss records.