There are just hours until McGregor and Mayweather touch gloves in the ring in what will be one of the most watched sporting events in history.
But only two years ago it was Pacquiao who shared the limelight with Mayweather.
The two were regarded as the best pound-for-pound fighters throughout their careers and were criticised for not scheduling the fight earlier when both were in their prime.
Still the fight drew a massive audience and broke all sorts of pay-per-view records.
Mayweather won on points in what proved to be a disappointing affair with many criticising the American for his reserved nature throughout the fight.
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And with Mayweather heading back into the ring for one final swan song, Pacquiao couldn’t help but aim one final dig at his former rival before later deleting the post.
Mayweather tweeted: “Talking doesn’t win fights.”
He of course was referring to McGregor’s constant trash talk, but Pacuqiao pounced on the opportunity to troll Mayweather.
Pacquiao said: “but running does 😉 God bless on your fight tonight!”