Castren won the 2011 Doral Publix Junior Classic in the U.S. and the 2013 Skandia Junior Open in Sweden, and was runner-up at the 2013 Portuguese Ladies Amateur. She represented Finland at the 2011, 2012 and 2013 European Girls' Team Championship, the 2014, 2015 and 2016 European Ladies' Team Championship, and at the 2014 and 2016 Espirito Santo Trophy. She was also on the winning Vagliano Trophy team in 2017.
Castren played college golf at Florida State University beginning in 2014 and graduated in May 2017 with a degree in International Affairs, after winning seven individual titles in collegiate competition during her time with the Florida State Seminoles women's golf team, a school record. She was named second-Team All-American by the Women's Golf Coaches Association and Golfweek in 2014 and was a three-time All-ACC selection (2014, 2016 and 2017) as one of only three players in school history. She set school record for lowest career stroke average (72.52) over her four-year varsity career.
Castren played two seasons on the Symetra Tour in 2018 and 2019, before she finished T26 at the LPGA Final Qualifying Tournament to earn her card for the 2020 LPGA Tour. In only six starts she earned enough to qualify via the money list for her first major, the 2020 Women's PGA Championship, where she was T9 after a first round of 69 and finished the tournament T23.

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