Conor McGregor still an underdog but odds shift for potential showdown with Floyd Mayweather

Conor McGregor has inked his part in the deal for a showdown with Floyd Mayweather in boxing as UFC president Dana White continues negotiations to put together arguably one of the biggest fights in combat sports history.

Rumors about the matchup have been raging for more than a year but now the fight appears closer than ever to reality with the UFC signing off on McGregor's participation in the matchup.

When rumors about the McGregor vs. Mayweather fight first broke, the retired boxing champion opened as a massive favorite in the fight against the currnet UFC lightweight champion.

Odds makers had Mayweather installed as high as a -2500 favorite with McGregor at +1100 as the underdog.

With news that the fight is closer now than ever before, the odds makers at BetOnline.ag have moved the lines just slightly but now Mayweather's status as favorite has dropped considerably.

Mayweather is now sitting at -1500 as the favorite — a huge change from the lines that opened earlier this year — with McGregor as a +1000 underdog in the fight.

Of course these odds will continue to fluctuate, especially if McGregor and Mayweather actually come to an agreement for the fight.

Once both sides ink the deal, more betters will begin putting down money on the fight, which will then push the lines to either favor Mayweather even more or potentially see McGregor's underdog status shrink over time.