LAS VEGAS – As one of just two men to have fought both Manny Pacquiao and Mario Barrios, Keith Thurman is well placed to pontificate on their Saturday clash at the MGM Grand.

Manny Pacquiao returns from retirement on Saturday night to face WBC welterweight champion Mario Barrios. Whether Pacquiao's decision to return to the ring proves to be ill-advised or a moment that grows his legend is still to be seen.