Kelly Pavlik (left) vs. Sergio Martinez
Bravado or truth? Former two-time light heavyweight champion Antonio Tarver announced he would move up to the heavyweight division to take on David Haye and possibly the Klitschko brothers.
Tarver hasn't fought since suffering unanimous decision defeat at the hands of Chad Dawson May 9, 2009. It was the second of two straight unanimous decision losses to Dawson, who took Tarver's IBF light heavyweight title in the process.
Tarver, who has lost three of his last six fights, hasn't won since beating Clinton Woods in a unanimous decision in April, 2008.
Of course it's not news when light heavyweights or cruiserweights make the jump to heavyweight. But Tarver could have a tough time taking on the likes of Haye or either one of the Klitschkos.
Haye, a cruiserweight for most of his career, easily has the speed to hang with Tarver, while the Klitschko's disciplined style could fluster Tarver.
Casamayor vs. Guerrero added to Marquez-Diaz card
Joel Casamayor (37-4-1, 22 KOs) and Robert Guerrero (26-1-1, 18 KOs) will fight on the undercard of the Juan Manuel Marquez-Juan "Baby Bull" Diaz on July 31 at the Mandalay Bay.
That's just one of several primetime matchups. Brooklyn's Daniel Jacobs (20-0, 17 KOs) will take on Dmirty Pirog (16-0, 13 KOs) for the vacant WBO middleweight title, while Rocky Juarez will battle Jorge Linares in a lightweight bout.
Rahman wins, McCall loses
In a tale of two boxers trying to recapture past glory, Hasim Rahman and Oliver McCall both stepped into the ring. Rahman (47-7-2) had an easy time on Saturday night, scoring a fourth-round TKO over Shannon Miller. Referee Charlie Fitch stopped the bout 1:37 into the fourth round.
It wasn't easy for McCall who dropped a unanimous decision to Timur Ibragimov last Tuesday. The judges scored the bout 117-111 (twice) and 119-109. The former WBC champ dropped to 54-10.
Martinez to stay at middleweight
Sergio Martinez, who was stripped of his WBO middleweight title three weeks ago, will stay at middleweight, according to ESPN.com.
Martinez, the WBC 154 and 160 champ, lost his WBO belt for not announcing his decision before its deadline. Daniel Jacobs and Dmitry Pirog will fight for that belt at the Mandalay Bay on July 31.
Staying at 160 pounds gives Martinez the option of taking on smaller fighters at a catch weight between 155 and 160, his promoter Lou DiBella told ESPN.com.