Fres Oquendo hurt sparring, pulls out of bout vs. Ruslan Chagaev

Heavyweight Fres Oquendo suffered a shoulder injury during a recent sparring session at his Chicago training camp, forcing him to withdraw from his rematch against secondary titleholder Ruslan Chagaev.

They were due to meet on Oct. 17 at Sparkassen Arena in Kiel, Germany, but with Oquendo pulling out so close to the date of the fight the card has been called off.

"He injured his shoulder sparring, which has been confirmed by an MRI," Square Ring CEO John Wirt, Oquendo's co-promoter with Bobby Hitz, told ESPN.com on Tuesday.

"Technically, (it is) a likely anterior labral tear. I haven't heard yet how long he's going to be out, but I have been hearing that surgery may be required. It's really unfortunate because he was in fantastic shape and we were a little over a week from flying to Germany."

In June 2014, Oquendo traveled to Grozny, Russia, and lost a majority decision to Chagaev for a vacant secondary title. Wladimir Klitschko is the recognized world champion.

Oquendo had a rematch clause in the contract but Chagaev's team attempted to set up another title defense first. It got even uglier as Oquendo claimed he was not paid for the fight and the Chagaev team claimed Oquendo failed a drug test.

Oquendo's team sued in United States federal court to force the rematch and won an injunction to stop Chagaev from defending the belt against anyone other than Oquendo.

Ultimately, the sides made a deal under which Chagaev (34-2-1, 21 KOs), 36, a native of Uzbekistan living in Germany, was allowed to defend against Francesco Pianeta -- as long as the winner agreed to fight Oquendo (37-8, 24 KOs), 42, next. Chagaev knocked out Pianeta in the first round on July 11 in Magdeburg, Germany.

The Chagaev-Oquendo winner was to next fight Australian mandatory contender Lucas Browne.

Now it remains to be seen if and when Chagaev-Oquendo will be rescheduled. It will depend on how long Oquendo is going to be out of action. The court might also have a say in whether Chagaev can move on to another defense before facing Oquendo again.