Boxing Legend Floyd Mayweather Jr. is widely considered the greatest boxer of all times. Floyd will put his record of 49-0 on the line versus the greatest MMA fighter of all times and only ever fighter to hold two belts at the same time, Conor McGregor on August 26th in Las Vegas. This video is a compilation showing all the times Floyd was rocked in his entire career. Can Conor hurt him? see for yourselves. Check it out.