Photo — Conor McGregor: https://vimeo.com/237593610 (CC BY-SA 3.0) · Floyd Mayweather Jr.: Uncropped File:Floyd Mayweather, Jr.jpg from http://www.marines.mil/_layouts/imagemeta.aspx?image=http://www.marines.mil/unit/mcasmiramar/PublishingImages/100821-M-0807P-006.JPG (Public domain)
The Short Version
UFC champion Conor McGregor and undefeated boxing champion Floyd Mayweather Jr. engaged in a lucrative crossover feud that led to a August 2017 boxing match won by Mayweather. McGregor has continued to call out Mayweather for a rematch under MMA rules.
Latest Development
McGregor calls out Mayweather for MMA fight at UFC White House
McGregor posted on social media proposing an MMA rematch against Mayweather at a planned UFC event at the White House, claiming he could defeat Mayweather in 10 seconds under MMA rules.
January 6, 2026 · Public statement
The Beef
Chronological, newest first. Every entry cites a source.
Beef timeline
January 6, 2026
McGregor calls out Mayweather for MMA fight at UFC White House
Public statementMcGregor posted on social media proposing an MMA rematch against Mayweather at a planned UFC event at the White House, claiming he could defeat Mayweather in 10 seconds under MMA rules.
Source ↗August 26, 2017
Mayweather defeats McGregor by 10th-round TKO
Verified eventFloyd Mayweather Jr. defeated Conor McGregor via tenth-round technical knockout at T-Mobile Arena in Las Vegas, bringing Mayweather's professional boxing record to 50-0.
Source ↗July 11, 2017
Four-city promotional press tour launches
Verified eventMayweather and McGregor embarked on an international four-city promotional tour through Los Angeles, Toronto, Brooklyn, and London, trading heavy verbal jabs and publicity stunts.
Source ↗June 14, 2017
Mayweather vs. McGregor fight officially announced
Verified eventTerms were agreed upon for a 12-round professional boxing match at 154 pounds in Las Vegas, coming after McGregor obtained a California boxing license and agreed to fight terms.
Source ↗January 11, 2017
Mayweather counters McGregor's $100 million demand
Public statementFloyd Mayweather Jr. appeared on ESPN's First Take and countered Conor McGregor's demand for a $100 million purse with an offer of $15 million plus a cut of pay-per-view revenue.
Source ↗
Where It Stands
Active. Though Mayweather defeated McGregor via 10th-round TKO in their 2017 boxing match and subsequently retired from professional boxing, McGregor reignited public chatter in January 2026 by calling out Mayweather for an MMA rematch.
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Sources
- 1.SourceMcGregor calls out Mayweather for MMA fight at UFC White House · Jan 6, 2026
- 2.SourceMayweather defeats McGregor by 10th-round TKO · Aug 26, 2017
- 3.SourceFour-city promotional press tour launches · Jul 11, 2017
- 4.SourceMayweather vs. McGregor fight officially announced · Jun 14, 2017
- 5.SourceMayweather counters McGregor's $100 million demand · Jan 11, 2017
Allegations are attributed to the party that made them and are not statements of fact.