Born and raised in Gladbeck in North Rhine-Westphalia, Masson had a decorated amateur golf career.

After graduating from secondary school in Gladbeck in 2008, Masson accepted a golf scholarship to Oklahoma State University and played one year for the Cowgirls in 2008–09 before turning pro in December 2009.

[2][3] In late 2009, Masson entered the four-round LET Final Qualifying School as an amateur at La Manga Club, Spain.

[8] Paired with defending and eventual champion Yani Tseng in the final round, Masson carded a 78 (+6) to finish tied for fifth, seven shots back.

Masson won her first LET event at the 2012 South African Women's Open, winning by one stroke over Lee-Anne Pace and Danielle Montgomery.