Marcos Maidana admitted that he ran out of steam in his first fight against Floyd Mayweather Jr., but the Argentine challenger vowed that he will come more prepared to go the distance in their upcoming rematch.

Maidana, who will face Mayweather for the second time on Sept. 13 at the MGM Grand Garden Arena in Las Vegas, said in an interview that he failed to sustain his energy, which is the reason why the reigning pound-for-pound king managed to recover in the latter part of the match. 

"Losing had a lot to do with conditioning," Maidana said, BoxingScene reported on Sunday. "The times when he decided to box was because I let him get away. I let him be able to box and move. I think that I did well to force him to fight because of the pressure I put on."

But in their upcoming rematch, Maidana, who will look to reclaim the World Boxing Organization welterweight title that he lost in the first fight, said that he will not get tired on Sept. 13.

"This time around, I'm not going to get tired," Maidana said. "I'm going to be on him from the opening bell, for the entire fight, and I think that's going to force him to fight."

Robert Garcia, Maidana's trainer, echoed his fighter's statement, but he expects the 31-year-old to be in his best possible shape now that they had nine weeks to prepare compared to just five during the first fight.

"We had about five weeks before the fight," Garcia said. "Even though Chino came in already semi-in-shape, it was still not the same. This time he came here nine weeks before the fight, started training, [had a] full camp. We had a good eight weeks of training."

Garcia is confident that the longer training camp will be a great factor in the rematch, expressing hope that the Buenos Aires native will manage to hand Mayweather the first defeat of his career.

"I think it's going to make a big difference, you know? Five weeks compared to eight weeks of training makes a difference in this type of fight." Garcia said. "I think with everything that he's doing and learning in camp, we should see a different fight this time."

Aside from the WBO welterweight title, Mayweather, who holds a perfect 46-0 record, will put his World Boxing Council welterweight and light middleweight titles at stake in their highly anticipated showdown.