Mayweather vs. Guerrero results recap from last night: Floyd Mayweather dominates Robert Guerrero in Las Vegas

For a few minutes, it really looked like Robert Guerrero had a shot.

He was landing his left. He was roughing up Floyd Mayweather on the inside. He even was countering his opponent's signature straight right with a heavy left uppercut to the body.

But you can't beat Floyd Mayweather with just a good Plan A.

As the undefeated pound-for-pound king demonstrated in the main event of Saturday night's (May 4, 2013) four-fight Showtime "May Day" broadcast from the MGM Grand Garden Arena in Las Vegas, Nevada, you also need a Plan B, C, D, and probably all the way to at least M.

Once Floyd got his range and adjusted to his southpaw foe, his right hand turned into a heat-seeking missile, connecting at a ridiculous 60-percent rate. Guerrero, tough as nails and relentless as hell, could no longer find him with his longer punches, his offense being diluted into short arm strikes in the clinch.

He had Mayweather on the ropes or in the corner dozens of times, and all he got was Floyd's glove in his face at high velocity.

Floyd turned 36 this year, but like fellow aging superstars Bernard Hopkins and the Klitschko brothers, he's so technically proficient and so adept at not taking damage that he was every bit as spry as the six-year-younger Guerrero, taking home a unanimous decision win on scores of 117-111 across the board.

There's really not much more I can say; it was vintage Floyd. His defense, as always, was stellar, while Guerrero was missing on four of every five punches he threw and being thoroughly unable to capitalize on the times he got Floyd to the ropes or corner. Every mistake he made was met by that lethal right hand.

Floyd is still number one, and I don't see anyone south of 160 taking that away from him.

The rest of the event was entertaining, starting off with prospect J'Leon Love surviving a sixth-round knockdown to eke out a split decision win over gritty veteran Gabriel Rosado. Next, Mexican prospect Leo Santa Cruz buried former flyweight titlist Alexander Munoz under a ridiculous number of punches, forcing the latter's corner to intervene after a second knockdown in round five.

The co-feature between sluggers Abner Mares and Daniel Ponce de Leon was exciting while it lasted, but ended in controversy.

After getting floored by a left hook in the second round, the awkward Ponce de Leon seemed to be taking over with heavy pressure, perhaps a product of Mares being unaccustomed to featherweight. In the ninth round, however, a massive right hand from Mares landed as they separated and put Ponce de Leon down hard.

Abner refused to let him off the hook when he got back up.

With his back to the ropes, Ponce de Leon fired back while eating big shots, but referee Jay Nady nonetheless saw fit to stop the fight. Perhaps understandable, considering the punishment Daniel was taking, but nonetheless dissatisfying.

That's a wrap from "Sin City." For full live results and play-by-play of the night's proceedings, click here.

What did you think of the fight? Is there anyone out there who can stop Mayweather?