( CNN ) -- Ali-Frazier . Leonard-Duran . Gatti-Ward . Zale-Graziano . Most of boxing 's great rivalries produced three memorable fights , trilogies of spectacular action . They were entertaining fights that demanded sequels , then sequels that demanded sequels . Rare is the case when it takes a fourth fight to satisfy the fighters , the fans and the press . Boxers often have other rivals to battle , and younger fighters come along deserving their shots . But for Manny Pacquiao ( 54-4-2 , 38 KOs ) and Juan Manuel Marquez ( 54-6-1 , 39 KOs ) , their legacies require one more battle in the ring , a fourth fight that will give one a chance to finally hear his name pronounced the winner and a match that could allow the other to push aside the controversial decisions of the past . That comes Saturday night at the MGM Grand in Las Vegas when the two meet in a non-title fight . Pacquiao has , in the eyes of the judges , won two of the previous matches . The first was ruled a tie . He believes he won all three . Marquez fervently believes he won all three . Public sentiment and the opinion of sports media fall mostly in the middle . Roach : Beaten Marquez deserves fourth Pacquaio fight . What everyone agrees on is that the fights have been great . Pacquiao comes hard after Marquez , who counterpunches superbly . Pacquiao has knocked Marquez down four times , three of which came in the first round of the first fight . Had the referee stopped the fight , as they often do after a boxer falls three times , the trilogy would have been a quick one-night stand , or one-night fall , as it were . Now the two fighters are forever linked . Marquez , 39 , thinks that even though they are fierce rivals now , that might change . He told reporters they might even become friends . `` Because of the great rivalry we had in the ring . I have nothing against him except for the decisions , '' Marquez , who is Mexican , said , according to an interpreter . `` I do n't see why we ca n't have a personal relationship and not just a professional relationship . '' But on HBO 's 24/7 documentary series , he admits there is some animosity , at least on his part . `` As professionals , we respect each other , '' Marquez said . `` But after everything that 's happened , it 's starting to get personal . It 's heavier . There 's more anger . That 's how the fourth fight will be . '' The soft-spoken Pacquiao , a Filipino legend , always carefully chooses his words . `` I never hate my opponent outside of the ring , '' he said . `` It is just my job to fight , and there is nothing personal . I guess we are kind of friends because I look at all of my opponents as a friend . '' Pacquiao 's last fight gave him a taste of what Marquez has felt during the reading of the scorecards for their battles . It appeared Pacquiao dominated Timothy Bradley in a 12-round welterweight title fight in June , but he lost the decision on two of the three judges ' scorecards . Naturally everyone predicted a fall rematch , but it did n't materialize . It has a lot to do with money , as Marquez is a better name on the marquee and Saturday 's fight stands to draw more viewers to pay per view . According to Yahoo Sports , Pacquiao stands to make at least $ 8 million guaranteed and as much as $ 30 million if the pay-per-view sells well . Marquez is guaranteed $ 3 million , Yahoo reported . Pacquiao , 33 , is more diplomatic about why he is fighting Marquez instead of Bradley . `` I am giving him a chance . I am giving him a chance to prove he can win the fight because he thought he has won all three and he keeps talking about it , '' he said . `` So it is very important to me to win this fight , especially since Marquez really wanted this fight . '' 'Pacman ' loss leaves Philippines fans stunned . Some people have speculated that despite two previous wins , Pacquiao might need a clear victory over Marquez this time to avoid the judges rewarding him for past perceived injustice . Pacquiao 's long-time trainer Freddie Roach has even said that they ca n't win if they do n't get a knockout . At a press conference announcing the fight , Pacquiao used his thumb to scratch into the tablecloth , `` We need to win by knockout '' for Roach to see . `` I said , 'Yes , we do , ' '' Roach said . `` That is the best news I 've seen yet . Usually it 's God will decide or it 'll be a close fight or I 'm not going to predict anything . `` And the thing is , who is going to give Manny Pacquiao the fourth fight if it 's another close call ? '' Marquez said he also feels the need to knockout his opponent to clearly win . He wo n't change his style , but he said he will fight `` with intelligence '' and more aggression , Marquez said . Roach said his fighter will make sure the pace is more up-tempo . `` I think it 's going to be a sensational fight . Juan is the most difficult fighter that Manny Pacquiao has ever faced , '' Marquez 's trainer , Nacho Beristain , said .
Fourth fight in Pacquiao - Marquez rivalry will give one a chance to proclaim himself the winner . The first three fights resulted in a draw and two close wins for Manny Diaz . They will meet next night in a non - title battle in Las Vegas .