See main article: article and 2021 Karlsruhe Open.
The 2021 Karlsruhe Open (also known as the Liqui Moly Open for sponsorship reasons) was a professional tennis tournament played on outdoor clay courts. It was the 2nd edition of the tournament and part of the 2021 WTA 125K series, offering a total of $125,000 in prize money. It took place in Karlsruhe, Germany between 7 and 12 September 2021. The tournament did not take place in 2020 due to the COVID-19 pandemic.[1] The singles part of the tournament had 32 competitors. Patricia Maria Țig was the defending champion, having won the previous edition in 2019,[2] but chose not to participate. Mayar Sherif won the title, defeating Martina Trevisan in the final, 6–3, 6–2.