Kenin reached a career-high of No.
2 in the ITF junior rankings.
She began playing in low-level Grade 4 events on the ITF Junior Circuit in 2012 at the age of 13.
After winning her first titles in both singles and doubles in 2013, she progressed to the Grade 1 level.
Towards the end of the year, she made her Grade A debut at the Orange Bowl, reaching the semifinals in singles and finishing runner-up in doubles with Kaitlyn McCarthy to Tornado Alicia Black and Naiktha Bains.
Kenin made her junior Grand Slam debut in 2014, but only recorded one match win in singles while playing in the latter three events of the year.
Following the US Open, Kenin represented the United States at the Junior Fed Cup alongside CiCi Bellis and Black.
The team won the tournament, sweeping Slovakia 3–0 in the final.
Kenin went undefeated in her five matches, all in doubles.
Her next breakthrough came towards the end of the year when she won the Orange Bowl, defeating Bellis and Ingrid Neel in the last two rounds.

Kenin built on that success in 2015 by winning the USTA International Spring Championships, a Grade 1 tournament.
During the summer, she won the USTA Girls 18s National Championship as the No.
3 seed, defeating the No.
1 seed Black in the final.
With the title, she earned a wild card into the main draw of the 2015 US Open.
Kenin also participated in the junior event at the US Open and finished runner-up to Dalma Gálfi, her best performance at a junior Grand Slam event.
This result helped her rise to No.
2 in the world by the end of the year.
Kenin continued to play on the junior tour in 2016 while primarily playing in professional events on the ITF Women's Circuit.
At the US Open, she again produced one of her best results of the year, losing in the semifinals to Viktória Kužmová after upsetting the No.
1 seed Anastasia Potapova in the previous round.
Kenin reached a career-high of No. 2 in the ITF junior rankings. She began playing in low-level Grade 4 events on the ITF Junior Circuit in 2012 at the age of 13. After winning her first titles in both singles and doubles in 2013, she progressed to the Grade 1 level. Towards the end of the year, she made her Grade A debut at the Orange Bowl, reaching the semifinals in singles and finishing runner-up in doubles with Kaitlyn McCarthy to Tornado Alicia Black and Naiktha Bains. Kenin made her junior Grand Slam debut in 2014, but only recorded one match win in singles while playing in the latter three events of the year. Following the US Open, Kenin represented the United States at the Junior Fed Cup alongside CiCi Bellis and Black. The team won the tournament, sweeping Slovakia 3–0 in the final. Kenin went undefeated in her five matches, all in doubles. Her next breakthrough came towards the end of the year when she won the Orange Bowl, defeating Bellis and Ingrid Neel in the last two rounds.
Kenin built on that success in 2015 by winning the USTA International Spring Championships, a Grade 1 tournament. During the summer, she won the USTA Girls 18s National Championship as the No. 3 seed, defeating the No. 1 seed Black in the final. With the title, she earned a wild card into the main draw of the 2015 US Open. Kenin also participated in the junior event at the US Open and finished runner-up to Dalma Gálfi, her best performance at a junior Grand Slam event. This result helped her rise to No. 2 in the world by the end of the year. Kenin continued to play on the junior tour in 2016 while primarily playing in professional events on the ITF Women's Circuit. At the US Open, she again produced one of her best results of the year, losing in the semifinals to Viktória Kužmová after upsetting the No. 1 seed Anastasia Potapova in the previous round.
Sofia Kenin