Brock Lesnar failed a fight-night drug test at UFC 200 on July 9, according to the United States Anti-Doping Agency (USADA).

The test revealed the presence of a banned substance, which a source identified as Clomipene, an anti-estrogen blocker.

What happened?

Lesnar, 39, was notified of the failed test, his second in a month, after submitting a sample at UFC 200 in Las Vegas.

He won the fight against Mark Hunt via unanimous decision, earning a $2.5 million purse.

Why it matters for Brock Lesnar

The failed test may result in sanctions, including a fine and suspension, under the UFC's anti-doping program.

Lesnar's victory over Hunt could be changed to a no-contest pending a successful appeal.

The UFC and Nevada State Athletic Commission (NSAC) will review the case and determine the appropriate action.

What comes next?

Lesnar has not publicly disclosed whether he intends to have his B-samples tested, which could confirm or contradict the initial results.

The NSAC retains jurisdiction over the matter, and Lesnar will be subject to their rules and regulations.

Lesnar's opponent, Mark Hunt, demanded Lesnar's entire paycheck after news of the initial failed test, citing concerns over fairness and sportsmanship.

Hunt's reported purse was $700,000, significantly less than Lesnar's $2.5 million.

The UFC's anti-doping program requires retired fighters to undergo a four-month testing window before resuming competition, but the UFC waived this requirement for Lesnar.

Lesnar submitted eight total samples to USADA, with the June 28 test being his first failed test.

USADA official Ryan Madden confirmed that Lesnar had submitted multiple test samples before June 28, all of which came back clean.

Lesnar's response to questions about performance-enhancing drugs was "I'm a white boy and I'm jacked. Deal with it."

The situation has sparked controversy and debate in the MMA community, with many calling for stricter penalties and more rigorous testing.

Lesnar's future in the UFC remains uncertain, with his contract status and potential sanctions pending resolution.

The UFC will provide additional information as the process moves forward, according to their statement.