Amir Khan (L) and Devon Alexander face off. Photo by Joe Scarnici/Getty Images.

RingTV.com has a live round-by-round update of Saturday’s welterweight clash during which Amir Khan dominated a clash of former titleholders by unanimous decision over southpaw Devon Alexander at the MGM Grand in Las Vegas.

Khan out-landed Alexander in total punches (243-to-91), power shots (120-to-69) and jabs (123-to-22), with Alexander winning a total of three rounds on the cards of the three judges.

A two-division title winner, Alexander (26-3, 14 knockouts) had been dethroned as IBF 147-pound beltholder nearly a year ago this week following a unanimous decision loss to Shawn Porter on Dec. 7 but the 27-year-old rebounded with a unanimous decision over Jesus Soto Karass in his last fight in June.

The 28-year-old Khan (30-3, 19 KOs) was coming off a one-sided unanimous decision victory over former titleholder Luis Collazo, a southpaw who was floored three times during Khan’s 147-pound debut in May.

Their focus on each other notwithstanding, Khan and Alexander realize a fight against Floyd Mayweather Jr. could be in the future for Saturday’s winner.

The Showtime broadcast begins at 9 p.m.

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Khan vs. Alexander

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Referee: Robert Byrd

Judges: John McKaie, Glenn Feldman, and Jerry Roth scored the fight, 118-110, 119-109, and, 120-108, respectively, all for AMIR KHAN BY UNANIMOUS DECISION!!!!

Devon Alexander enters the ring first, Amir Khan, second.

Khan trained by Virgil Hunter, Alexander , Kevin Cunningham.

RINGTV.COM HAS IT FOR KHAN, 119-109.

Round 1: Fighters in the center of the ring, Khan and the southpaw Alexander. Both jabbing early. Nothing material until Khan lands an overhand right over the jab. Khan lands another right after his own jab. Long left by Alexander, who takes a head-swiveling right hand after the jab. Two right hands for Khan during the clinch. Nice jab by Alexander. Jab to tghe body for Khan. Speed edge giving Khan the advantage early. Another body jab by Khan. Right and left by Khan and a straight left to the body. Right hook clips Khan. Left hook by Khan just prior to the bell. Khan, 10-9.

Round 2: Khan leads with an early jab. Alexander giving ground somewhat and takes a right. Another right by Khan and a third. Another right by Khan grazes. Alexander trying to position himself for a solid counter. Jab to the body by Khan and a right. Alexander trying to time Khan’s right hand. Left by Alexander. Two more rights by Khan. And another by Khan. Two lefts by Khan but a right by Khan lands followed by a hook. Khan is out-speeding and out-hustling Alexander thus far. Hard right to the body by Khan prior to the bell. Khan, 10-9; Khan, 20-18.

Round 3: Hunter is happy with Khan, telling him Alexander is frustrated. Cunningham says Alexander has Khan where he wants him. Khan lands an early broad-side hook. Alexander needs to step up the pressure. Left by Alexander grazes. Right lands by Alexander. Khan misses a counter left hook. Jab by Alexander and one by Khan. Jab to the body for Alexander, who needs to close distance. close round. Grazing right by Khan and a right by Khan that counters the jab. Fighters warned to watch their heads. They trade lefts. Right by Khan and a clinch. Another right and two jabs from Khan. Speed again killing Alexander. Right to the body by Khan. Khan, 10-9; Khan, 30-27.

Round 4: Cunningham asking for the double-jab from Alexander. Jab to the body and right by Khan, left and later a right by Alexander. Right by Alexander, hook by Khan. Alexander grazes with the jab. Double-left hook by Khan grazes. Double-jab by Alexander and another jab by Alexander. Lead hook by Khan and another left. Khan still dictating the pace. Right to the body and clinch by Khan. Double hook by Khan. Two jabs by Alexander graze and a left to the body by Alexander. Left, right, left by Khan and a jab. Right to the head and a left to the body by Khan. Speed, yet again, the difference for Khan. Jab by Khan and hook to the body by Khan, left by Khan. Lead straight right by Khan, left by Alexander. Khan, 10-9; Khan, 40-36.

Round 5: Hunter telling Khan to stay focused and that he is winning every round. Cunningham wants Alexander to to go the body and then the head. Khan out-jabs Alexander, two to one. Two more jabs and a left to the body by Alexander. Left by Khan to the head and a jab to follow. Right by Khan over the jab. Left by Alexander lands solidly. Kah lands two hooks. Grazing right by Khan, left uppercut inside by Alexander. Right to the body by Khan, right hook by Alexander, left jab by Khan. KKhan doing a good job getting out after delivering blows. Left by Alexander, who takes a right. Straight right by Khan. Alexander trying to press more toward the end. Khan, 10-9; Khan, 50-45.

Round 6: Jab by Khan to the ear and a clinch. Alexander can’t seem to close distance on Khan. Khan’s not falling for the counters. Left hook by Khan. Double-jab by Khan. Hook by Khan. Right and left by Khan. Left to the body by Alexander. Jab by Khan over Alexander. Jab and right hand by Khan. Hook by Khan on the counter. Double-jab by Alexander. Left hand by Alexander, hook by Khan. Khan maintaiing the edge in activity. Khan, 10-9; Khan, 60-54.

Round 7: Alexander lands an early combination as a sign of aggression, but will it last? Showtime’s Steve Farhood has it for Khan, 60-54. Khan lands a left and a jab. Khan fires and lands two jabs. Jab by Khan, left by Alexander. Khan giving ground more during the middle of the round, but then, lands a right cross. Jab and left by Alexander, jab and right by Khan. Alexander can’t get into range. Left by Alexander. Jab to the body by Alexander. Jab, jab, right uppercut and right by Khan. Jab by Khan. Hook by Khan behind the ear and a right cross by Khan in retreat. Khan, 10-9; Khan, 70-63.

Round 8: Alexander needs to go for broke and needs a KO, but takes a left hook then lands a four-punch, left, right, left, right combination. Again, the blazing speed of Khan. Farhood has it for Khan, 70-63. Khan lands a straight right and left hook. Alexander has no answer. Jab by Alexander, right by Khan. Solid boxing by Khan. Khan blocks a left by Alexander and lands a right and left. Counter left by Alexander and a left. A right by Alexander. Khan retreating. Right hook by Alexander. Decent round for Alexander, but Khan lands a left to the body. Right by Khan. Left hook by Khan. Alexander, 10-9; Khan, 79-73.

Round 9: Khan Triple-jabs and grazes with a followup right. Hard left by Khan and a right. Farhood has it for Khan, 79-73. Jab and right by Khan. Left to the body for Alexander. Right by Khan. Left to the body by Alexander, right by Alexander. Right to the body by Khan. Right by Khan. Jab by Khan, Khan, 10-9; Khan, 89-82.

Round 10: Alexander being told to “Go get him” Cunningham. Right hand splits Alexander’s guard. Farhood has it 89-82 for Khan. Left by Alexander. Left hook by Khan and a jab. Jab by Khan, jab by Alexander. Hook by Khan in retreat. Right to the body by Khan, two rights to the head over the jab by Khan. Easy work for Khan. Left by Alexander. Hook by Khan. Another hook by Khan and a left by Alexander. Jab and right at the bell for Khan. Khan, 10-9; Khan, 99-91.

Round 11: Khan lands an erly hook during an exchange and later, double-jabs. Khan still being beaten to the punch. Farhood has it for Khan, 99-91. Two more Khan jabs. Jab and left by Alexander, who takes a right. Double-jab by Khan. Khan is so at ease and confident. Hook to the body and head by Khan with movement. Khan staying just out of reach, lands a hook. Alexander simply going through the motions. Hook by Khan down the middle. Left by Alexander, right and left by Khan, right hook by Alexander. Khan, 10-9; Khan, 109-100.

Round 12: Khan lands an early left hook and a head-swiveling right. Another left hook, jab and right by Khan. Farhood has it for Khan, 109-100. Left by Alexander, who takes a hook. Khan dominating. Double-jab by Khan. They trade jabs. Left and right by Khan and the sequence is repeated. Complete dominance in every aspect by Khan. Hard left by Alexander. Khan raises hands skyward with confidence. Khan, 10-9; Khan, 119-109.

RINGTV.COM HAS IT FOR KHAN, 119-109.