By Edward Chaykovsky

Back in 2010, Floyd Mayweather Jr. and Manny Pacquiao were negotiating a highly anticipated welterweight showdown. The two sides were very close to a deal and just about every significant point was agreed upon.

Just when both sides were anticipating a done deal, the negotiations took a serious turn for the worse when Pacquiao rejected Mayweather's contractual demand for a random drug testing protocol.

Pacquiao's refusal effectively crippled the negotiations and led to a lot of questions being raised regarding his incredible run through the weight divisions.

Hall of Fame coach Freddie Roach, who trains Pacquiao, admits his side is to blame for the first round of negotiations falling apart.

Since that time, Pacquiao tried to offer everything, without success, to get Mayweather in the ring - including a full agreement to take part in random drug testing and even a 60-40 split of the profits.

"At first there was a blood problem, Manny not wanting to give blood testing because he didn't like that at first. When we lost our first fight together, he forgot to do the blood testing before the fight, so he had to do it the day before. The commission demanded that he do it the day before.  He said 'if I'm going to give blood, I'm not going to be back for three or four days.' He had it in his mind that would make him weak and so forth. He felt that's why he lost that fight. He kind of mentally thought that would make him weak," Roach told HBO's The Fight Game.

"The original negotiations were probably our fault for not going so well, because of the blood issues. After that we offered everything. We even offered a 60-40 split at one time. I think we ok'd that at one time. He just has been silent since that moment, never said nothing and never talks about Manny Pacquiao in fights."