Jana Fett: Tennis Star Provisionally Suspended for Doping Violation

Former world No. 97 Jana Fett has been provisionally suspended by the International Tennis Integrity Agency (ITIA) following a positive drug test during her participation in the Billie Jean King Cup 2025. The test revealed the presence of three prohibited substances: SARM Ostarine (S-22), a metabolite of LGD-4033, and metabolites of GW501516.

A Positive Test and Provisional Suspension

The ITIA announced that the sample was collected on November 16, 2025, in Varadzin, Croatia, during the Billie Jean King Cup competition. Subsequent analysis of both the ‘A’ and ‘B’ samples confirmed the presence of the prohibited substances. As two of these substances are classified as “non-specified” substances, an obligatory provisional suspension was enacted, beginning on December 22, 2025.

Did You Know? Jana Fett reached her highest career ranking of 97th in the world in October 2017.

Fett, currently ranked 189th, last competed in a sanctioned tournament on December 4, 2025, at the ITF W50 Selva Garden in Italy, where she was defeated in the qualifying rounds. Prior to this, she represented Croatia in the Billie Jean King Cup 2025.

Player Response and Potential Next Steps

Fett has publicly stated her innocence and her full cooperation with the authorities. She expressed her commitment to clean sport and equitable competition, asserting that she has never knowingly or intentionally taken any prohibited substances. She has indicated her intention to “establish (her) innocence,” though the ITIA has noted she has not yet filed an appeal.

Expert Insight: Provisional suspensions are standard procedure in cases involving non-specified substances, designed to ensure the integrity of competition while investigations are underway. The length of any eventual ban will depend on the outcome of the ITIA’s investigation and any potential appeals process.

In April 2025, Fett achieved a notable victory over Donna Vekic (ranked 20th at the time) at the WTA 500 tournament in Stuttgart, ultimately reaching the round of sixteen before losing to Iga Swiatek.

Frequently Asked Questions

What substances were found in Jana Fett’s sample?

The ITIA reported that Fett’s sample contained SARM Ostarine (S-22), a metabolite of LGD-4033, and metabolites of GW501516.

When was the sample collected?

The sample was collected on November 16, 2025, during the Billie Jean King Cup competition in Varadzin, Croatia.

What is the status of Jana Fett’s participation in tournaments?

Jana Fett is currently provisionally suspended from all tennis competitions, effective December 22, 2025.

What implications might this situation have for the future of professional tennis and the ongoing fight against doping in the sport?