(co.uk) - It's official, folks -- Victor Ortiz is not in Kansas anymore.

And while I concede his hard-luck back story is still second to none, it's just as clear that he came to Las Vegas Saturday night to participate in an event for which he was woefully unprepared.

In practical terms, the poor kid brought a knife to a gunfight.

Oh, sure, he'd done all the right things going in. He flexed for the "24/7" cameras, boldly claimed Floyd Mayweather Jr. had outlived his shelf life and arrived at the MGM Grand ring with a strut typically reserved for those with more than one title-fight win in a seven-year pro career.

And once inside, bless his heart, he kept trying to play that leading man role. He landed a couple left-hand leads. He pushed and shoved his elder in the corners. And he resurrected a maniacal smile from the Andre Berto fight during the short bursts when combat was intensified.

But when the fourth round arrived, he got himself in over his, errr... head.

Perhaps determined to exact a pound of flesh before being swept away by decidedly negative momentum, Ortiz initiated another roughhouse scrum, and -- before referee Joe Cortez could intervene fairly and firmly -- sprung forward on his toes to drive his skull into Mayweather's face.

The true intent of such a punk move? Who really knows.

Maybe he was looking to break a nose. Maybe he was hoping to open a cut. Or maybe, as he tried to sell to gullible microphones and cameras in the aftermath, maybe it was just an accident.

Regardless, the angry look on Mayweather's face was visible.

And as he impatiently paced while waiting for Cortez to issue a penalty, his message was undeniable:

"You, my friend ... just wrote a check that you're a-- can't cash."

The five-division elite showed his ire with a combo as vicious as there's been this side of Manila, reducing his foe to ex-champ status and riling 80-year- old HBO analyst Larry Merchant to the edge of verbal senility.

It was both a predictable and pathetic display from the agenda-wielding Merchant, whom Mayweather has clearly rubbed the wrong way since beginning a weight-class climb with a 130-pound belt in 1998.

The old coot has recited the same drivel repeatedly in Mayweather's HBO afterglows, most recently eschewing deserved praise to claim "everyone knew going in" that he'd whip Shane Mosley in 2010.

Of course, when his network's latest cash cow beat the same guy a year later -- albeit on another network -- it was parade-worthy.

And, apparently, the fact that the new cow was twice as heavily favored as his predecessor didn't matter to the grumpy old man, who's never been one to let truth get in the way of a good tantrum.

But, fortunately on Saturday night, reason eventually prevailed.

Not only did the geezer's own ringside colleague -- a Hall of Famer named Emanuel Steward -- immediately say Mayweather had done nothing wrong in answering Ortiz's foul with brutal fairness, but Cortez spoke up as well later with a similar diagnosis.

"Time was in," the referee said.

"The fighter needed to keep his guard up. Mayweather did nothing illegal."

So, while Merchant's bratty in-ring challenge has been the lead item in early- week postmortems, it's an unfair smokescreen to obscure yet another elite performance.

Not only did the new kingpin beat a streaking title-holder 10 years younger and 14 pounds heavier, but he did so in a manner -- stalking the bigger man, pressing the fight -- that ought to at least temporarily shut the yaps of those still insisting he's a safety-first, exchange-averse bore.

And while I know he'll have pompoms ready for November's pay-per-view sequel, even Merchant's got to look in the mirror and realize the guy who's been feasting on leftovers -- De La Hoya, Hatton, Mosley and now Marquez -- might not really be ready for a seat at the grown-up table when push comes to shove.

My only fear for Mr. Merchant?

The shock of actually seeing Mayweather topple Manny Pacquiao might just kill him.

This week's title-fight schedule:

SATURDAY

Vacant IBF junior bantamweight title - Mexicali, Mexico

Raul Martinez (No. 1 contender) vs. Rodrigo Guerrero (No. 3 contender)

Martinez (28-1, 16 KO): Second title fight (0-1, 0 KO); beat Guerrero in 2010 (SD 12)

Guerrero (15-3-1, 10 KO): Second title fight (0-1, 0 KO); two wins in last four fights (2-2, 1 KO)

Fitzbitz says: "Strong southpaw flips script in championship rematch." Guerrero by decision

Vacant IBO welterweight title - Kempton Park, South Africa

Kaizer Mabuza (No. 12 contender) vs. Chris van Heerden (No. 38 contender)

Mabuza (23-7-3, 14 KO): Second title fight (0-1, 0 KO); 25th fight in South Africa (19-2-3, 11 KO)

Van Heerden (16-1-1, 10 KO): First title fight; unbeaten in South Africa (16-0-1, 10 KO)

Fitzbitz says: "Veteran outpoints newbie to capture first title belt." Mabuza by decision

Vacant IBO strawweight title - Kempton Park, South Africa

Michael Landero (No. 2 contender) vs. Hekkie Budler (No. 19 contender)

Landero (15-4-4, 5 KO): First title fight; unbeaten since 2008 (8-0-1, 5 KO)

Budler (18-1, 6 KO): Fourth title fight (2-1, 0 KO); held IBO belt (2010-11, one defense)

Fitzbitz says: "Filipino youngster continues climb up world ladder." Landero in 10

IBO junior flyweight/WBC light flyweight titles - Mexico City, Mexico

Gideon Buthelezi (IBO champion) vs. Adrian Hernandez (WBC champion)

If Hernandez wins, IBO title is vacant.

Buthelezi (12-2, 4 KO): First title defense; first fight outside South Africa

Hernandez (21-1-1, 13 KO): First title defense; unbeaten since 2008 (8-0, 2 KO)

Fitzbitz says: "Hometown edge for streaking 25-year-old incumbent." Hernandez by decision

SUNDAY

WBO middleweight title - Olimp, Russia

Dmitry Pirog (champion) vs. Gennady Martirosyan (No. 1 contender)

Pirog (18-0, 14 KO): Second title defense; 13 KOs in Russia (16-0)

Martirosyan (22-2, 11 KO): First title fight; unbeaten in Russia since 2005 (19-0, 10 KO)

Fitzbitz says: "Champion continues marked improvement since becoming elite." Pirog by decision

NOTE: Fights previewed are only those involving a sanctioning body's full- fledged title-holder -- no interim, diamond, silver, etc. Fights for WBA "world championships" are only included if no "super champion" exists in the weight class.

Last week's picks: 2-0 Overall picks record: 336-112 (75.0 percent)

Lyle Fitzsimmons is a veteran sports columnist who's written professionally since 1988 and covered boxing since 1995. His work is published in print and posted online for clients in North America and Europe. Reach him at fitzbitz@msn.com or follow him on Twitter.