RingTV.com has a live, round-by-round update of Saturday's welterweight bout between southpaw two-division titlist Devon Alexander and rugged Jesus Soto Karass at StubHub Center in Carson, Calif., on Showtime.

Alexander and Soto Karass share a common opponent in Marcos Maidana and are attempting to rebound from losses in their quest to remain relevant in the stacked 147-pound division.

Alexander (25-2, 14 knockouts), 27, debuted at 147 pounds with a unanimous decision over Maidana in February 2012 and is coming off a unanimous decision loss to Shawn Porter that dethroned him as IBF beltholder in December.

Soto Karass (28-9-3, 18 KOs), 31, was floored once each in the fifth and final rounds of a ninth-round stoppage loss to Keith Thurman in his last fight, also in December.

Prior to facing Porter, Alexander had scored a seventh-round stoppage of Lee Purdy in May 2013, representing his fourth straight victory since falling to Tim Bradley by 10th-round technical decision in January 2011.

Soto Karass is 4-2 with two knockouts over the course of his past six fights. In succession, Soto Karass has lost to Maidana by eighth round stoppage in Sept. 2012 and scored consecutive wins by majority decision over Selcuk Aydin in January 2013 and 12th-round technical knockout over former titleholder Andre Berto last July before losing to Thurman.

Click here for who wins Devon Alexander-Jesus Soto Karass?

The Showtime broadcast begins at 10 p.m. ET/7 p.m., PT

Alexander vs. Soto Karass

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Round 1: Alexander is popping his jab on a regular basis and moving well. The fighters are mixing it up, though. They are working at about the same rate in what has become a close round and an interesting fight so far. I think Alexander might've gotten a little more accomplished but Soto Karass landed the biggest punch of the round, an overhand right that got the crowd's attention.

Round 2: Alexander is boxing well, jabbing, moving, taking advantage of opportunities by throwing combinations. He's not landing big shots but he's controlling the action. Soto Karass is holding his own, though. And, of course, he keeps coming. Alexander finished with a nice flurry of hard, accurate shots.

Round 3: Alexander seems to be too talented and two quick for Soto Karass so far, as he is fairly clearly outboxing the Mexican fighter. Again, he's not landing big shots, which has allowed Soto Karass to maintain his aggression and keep him in the fight. Soto Karass just isn't getting much done. They had some spirited exchanges in the round but neither landed any big blows.

Round 4: Alexander is standing his ground a little more this round, sitting down on hard, accurate punches that did some damage. Naturally, Soto Karass welcomed the action. He got in some of his own eye-catching blows. Alexander got back on his toes later in the round, jabbing and throwing combinations from a safer distance.

Round 5: Alexander evidentally doesn't feel Soto Karass can hurt him, as he went back into warrior mode for much of the round. He a number of hard power shots, some of which landed. That allowed Soto Karass to get in a few of his own shots. Soto Karass is digging to the body now. That was probably Soto Karass' best round, which probably could've gone either way.

Round 6: Soto Karass is cutting off the ring now, fighting fiercely. And he's landing punches. Alexander is responding but he is working hard to fend off his foe. Soto Karass slowed down about a minute into the round, and Alexander picked up the pace, throwing (and landing) quick, combinations on the move to take control of the round.

Round 7: Soto Karass is punching to the body but probably not enough to slow Alexander down. Many of the shots he's throwing are to the head. Alexander is standing his ground again, exchanging punches on even terms with Soto Karass. That made for another close round in an entertaining fight so far.

Round 8: The fighters are exchanging punches in close again as Soto Karass never stops coming forward. I think Alexander gets the better of most exchanges, though. His punches are quicker and more accurate than soto Karass.' And he's much harder to hit cleanly. Alexander got back on his toes with about a minute to go. Soto Karass can't do much damage when he does that.

Round 9: Alexander went back into boxer mode, fighting off his jab and on his toes. He's outworking Soto Karass, who has done very little this round. He has trouble catching up to Alexander when he moves like this. I think Soto Karass should've targeted the body more earlier in the fight, which might've weakened Alexander's  legs. 

Round 10: Soto Karass, obviously going for broke, attacks like a wild man. Alexander stands his ground and fires back in some the most-entertaining action of the fight. The pace slowed after about a minute, and Alexander took charge, firing and landing a high volumn of punches in close. Alexander obviously didn't assume he had a big lead on the cards.

ÔÇïThe official scores: 97-93, 99-91 and 99-91. THE RING had it 98-92.