Floyd Mayweather Jr. takes questions during a news conference in Los Angeles on Thursday, Aug. 6, 2015. Mayweather is scheduled to face Andre Berto in a boxing bout Sept. 12 in Las Vegas. (AP Photo/Nick Ut)

LOS ANGELES (AP) โ€” Floyd Mayweather Jr. began promoting his final fight by doing what he does best.

Fending off every attack with defense that looks effortless.

The pound-for-pound king of boxing insisted Andre Berto is a worthy opponent for his grand farewell when they made a joint appearance in downtown Los Angeles on Thursday, just over five weeks before theyโ€™ll meet at the MGM Grand Garden Arena in Las Vegas on Sept. 12.

โ€œI donโ€™t know why, but Iโ€™m just training a lot harder for this fight,โ€ Mayweather said. โ€œI just want to go out with a bang, I guess.โ€

Mayweather also repeated his declaration that this is the last bout of his career, although he grinned broadly while saying it. Mayweather previously retired in 2008, but it barely lasted a year.

โ€œThey say theyโ€™ll offer me a lot of moneyโ€ to keep fighting, Mayweather said. โ€œI have a lot of money. Iโ€™m OK. โ€ฆ Itโ€™s the end of my (Showtime) deal. Iโ€™m an old man now. Iโ€™m 38.โ€

Three months after Mayweather (48-0, 26 KOs) dominated Manny Pacquiao in the most lucrative fight in boxing history, the welterweight champion was in a noticeably upbeat mood as he began the difficult business of promoting his next bout with Berto. The former 147-pound champion has lost three of his last six fights, including two losses to fighters who have already lost to Mayweather.

Mayweather acknowledged the backlash from his choice of Berto (30-3, 23 KOs), but cited the challengerโ€™s aggressive style and his own determination as reasons to buy the fight. Mayweather, who has knocked out one opponent in nine bouts since 2007, even promised an exciting fight to fans who still feel short-changed by his technical display against Pacquiao in May.

โ€œWith the way he comes, and with the way Iโ€™m going to come, if itโ€™s not a knockout, thereโ€™s going to be some knockdowns,โ€ Mayweather said. โ€œA lot. And thereโ€™s going to be blood. Thereโ€™s going to be knockdowns, and thereโ€™s going to be blood. A lot.โ€

Mayweatherโ€™s last bout raised his profile outside boxing to new heights, but also exposed him to unprecedentedly widespread criticism, with his legal history of violence against women spotlighted throughout the run-up to his win.

Contrasting sharply with the contemplative persona he employed in May, Mayweather was playful in his return to public appearances. He even commandeered a selfie stick to take a photo on the dais during the news conference.

Mayweather only turned serious Thursday when facing off with Berto for a photo opportunity. The fighters stared motionlessly into each otherโ€™s eyes for an uncomfortably long period of time.

Berto and Mayweather have been casual friends for several years, yet Berto didnโ€™t disagree with the assertion that Mayweather is a boring fighter. Berto saw the fan reaction to Mayweatherโ€™s bloodless brilliance against Pacquiao, and the challenger promised to make Mayweather work harder.

โ€œI know how people feel (after the Pacquiao fight), and itโ€™s my luck that I come right behind that,โ€ Berto said. โ€œIf I would have paid that type of money, I probably would have felt some type of way, too.โ€

Mayweather laughed off Bertoโ€™s first verbal jabs.

โ€œWell, heโ€™s fighting a boring fighter, but heโ€™s getting his biggest payday,โ€ Mayweather said.

Mayweather also defended his choice to put the fight on pay-per-view, asking an expected $75 to watch in high definition. Mayweather Promotions CEO Leonard Ellerbe said that putting the fight on free CBS was โ€œobviously something that we explored,โ€ but the promotion didnโ€™t have enough time to put together such a deal before Sept. 12.

The bout will complete Mayweatherโ€™s six-fight contract with Showtime, and he has repeatedly said he will walk away afterward. Yet Mayweather will face many temptations to continue, including the chance to surpass Rocky Marcianoโ€™s 49-0 record as the headliner in May at the opening of MGM Resortsโ€™ $350 million arena on the Las Vegas Strip.

Mayweather previously quit his sport in June 2008, saying he had โ€œdecided to permanently retire from boxingโ€ in his news release.

โ€œWe know that wasnโ€™t nothing but a vacation,โ€ Mayweather said with a laugh.

But even if he was returning to the boxing milieu for the final time, Mayweather projected an aura of calm before heading across the street to watch the WNBAโ€™s Los Angeles Sparks.

โ€œThey always tune in,โ€ Mayweather said of the haters. โ€œThey say one thing, but they do another.โ€

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