At the
2018 US Open, von Deichmann made tennis history for her country by becoming the first Liechtensteiner to reach the main draw of singles of a Grand Slam, after winning three matches in the
qualifying tournament. She defeated
Priscilla Hon in the first qualifying round,
Gail Brodsky in the second round and finally
Martina Trevisan also in straight sets to reach the main draw. She then lost by retirement to fellow qualifier,
Anhelina Kalinina, in the first round. Playing for
Liechtenstein Fed Cup team, von Deichmann has a win–loss record of 23–14 as of March 2024. She paired with
Yvonne Meusburger for her
WTA Tour debut at the
2014 Nürnberger Versicherungscup in
doubles, losing in the first round. Appearing as a lucky loser, Von Deichmann won her first completed WTA Tour match when she defeated eight seed
Anna Karolina Schmiedlova in straight sets in the first round of the
2024 Prague Open, having previously triumphed in two matches in Lugano 2018 and Seoul 2023 when her opponents retired injured. She lost to
Oksana Selekhmeteva in the round of 16. At the
2024 Țiriac Foundation Trophy, she reached her first WTA 125 final defeating sixth seed
Selena Janicijevic,
Despina Papamichail, top seed
María Lourdes Carlé, and wildcard
Patricia Maria Țig. She lost in the final to
Miriam Bulgaru. ==Grand Slam singles performance timeline==