Ketlen Vieira Hit With 6-Month Doping Ban After Cyborg Loss

Ketlen Vieira has been suspended for six months after testing positive for a steroidal substance banned by the World Anti-Doping Agency, stemming from her August 22 loss to Cris Cyborg at PFL Tampa.

Mike Mazzulli, director of the Mohegan Tribe Department of Athletic Regulation, confirmed that both Vieira's A and B samples came back positive for the same banned substance. The Mohegan Tribe commission took over as the PFL's anti-doping authority in 2025, replacing the United States Anti-Doping Agency, and oversaw testing for the Cyborg-Vieira card.

Cyborg struck a defiant tone when addressing the result, saying she believes "clean sport deserves strong enforcement" and thanking Mazzulli for running a "serious testing program."

What Happened at PFL Tampa

Vieira's night in Tampa was already a mess before the failed test became public. She missed weight by 7.2 pounds for her clash with Cyborg, stripping the bout of its PFL featherweight title stakes and turning the scheduled headliner into a non-title affair. Cyborg still handled business, dominating Vieira over five rounds to win a lopsided unanimous decision. Now that result comes with an asterisk, since the loser has been flagged for a banned steroidal substance collected during in-competition testing.

The fight marked Vieira's promotional debut after her UFC release earlier this year, a departure she called a "huge surprise" at the time, insisting she still belonged among the division's elite. She left the UFC with a win over rising prospect Jaqueline Cavalcanti, a result that made the cut all the more jarring to her. Vieira's UFC resume includes victories over former champions Holly Holm and Miesha Tate, as well as past title challengers Cat Zingano and Sara McMann. She was also tabbed as Kayla Harrison's hand-picked opponent for Harrison's UFC debut in October 2024, a fight Vieira lost by decision after giving the two-time Olympic judo gold medalist a difficult night.

Why This Complicates Vieira's PFL Future

A six-month suspension tied to a missed-weight, lopsided loss is about as bad a first impression as a new signing can make. PFL now has to decide how it handles a fighter who arrived with bantamweight pedigree but stumbled badly out of the gate on both the scale and the testing form. For bettors, the suspension does not change a settled result, Cyborg's decision win stands, but it does reshape how sportsbooks and fans should value Vieira going forward. A fighter returning from a doping suspension typically draws skepticism in the market until she proves herself clean and competitive again, and any future Vieira booking will likely open with that shadow attached to the price.

For Cyborg, the news only reinforces her position as one of the sport's most credible fixtures. She closed out the show as the only person who did everything right that night, making weight and winning clearly, and her public backing of the testing process plays well with a fan base that has grown wary of doping scandals clouding major cards.

Frequently Asked Questions

Why was Ketlen Vieira suspended?

Ketlen Vieira received a six-month suspension after both her A and B samples tested positive for a steroidal substance banned by the World Anti-Doping Agency, following her August 22 loss to Cris Cyborg at PFL Tampa.

Did Ketlen Vieira's suspension overturn her fight result against Cris Cyborg?

No, Cris Cyborg's unanimous decision win over Ketlen Vieira at PFL Tampa stands; the suspension is a separate anti-doping penalty.

Was the Cyborg vs. Vieira fight for a title?

The bout was originally scheduled for Cris Cyborg's PFL featherweight title, but it became a non-title fight after Ketlen Vieira missed weight by 7.2 pounds.