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MLB • A person familiar with the negotiations says the Chicago Cubs have reached a deal to trade pitcher Carlos Zambrano to the Miami Marlins for pitcher Chris Volstad. The swap is pending physicals and approval by Major League Baseball.

Zambrano wore out his welcome with the Cubs after repeated meltdowns. The former ace cleaned out his locker and talked about retiring after being ejected during a loss to Atlanta on Aug. 12. He was suspended without pay and then it was decided he would sit out the rest of the season.

Zambrano went 9-7 with a 4.82 ERA and has a year left on a $91.5 million, five-year deal.

• Joe Torre resigned Wednesday as Major League Baseball's executive vice president for baseball operations to join a group trying to buy the Los Angeles Dodgers. Torre managed the Dodgers from 2008-10, then retired and was hired by MLB in February as a top aide to Commissioner Bud Selig. He is part of a group headed by real estate developer Rick Caruso.

Boise State gives Petersen a raise

College football • Boise State's Chris Petersen has officially joined college football's $2 million coaching club. The State Board of Education voted unanimously Wednesday to give Petersen a $375,000 raise for 2012, the first step toward replacing his old contract with a new five-year deal designed to keep Petersen in Boise through January 2017.

Ronaldo has dengue fever

SOCCER • Former Brazil striker Ronaldo says he has dengue fever. Ronaldo tweeted Wednesday that he was discharged from a hospital the night before and is recuperating. He apparently contracted the mosquito-borne disease while vacationing at a northeastern Brazil beach town. Dengue can cause fever, headache and pain in muscles and joints. It's potentially fatal and there's no vaccine or specific treatment.

• Tim Howard became the fourth goalkeeper to score in the Premier League when the American put in a wind-blown clearance from about 100 yards during Everton's 2-1 loss to Bolton on Wednesday night.

Serena injures ankle, withdraws from Brisbane tourney

TENNIS • Serena Williams' Australian Open preparations took a major hit Wednesday when she injured her left ankle and withdrew from the Brisbane International. In her first tournament since losing the U.S. Open final in September, Williams was serving for the match with a 6-2, 5-3 lead against Bojana Jovanovski of Serbia when she twisted her ankle and crashed heavily to the court. The 13-time Grand Slam winner lay near the baseline for several minutes while getting medical attention. She was helped to a courtside chair and had the ankle re-taped before resuming the second-round match and losing the next point to surrender a service break to Jovanovski.

• Rafael Nadal and Roger Federer eased into the Qatar Open quarterfinals in rare cool and windy conditions in Doha on Wednesday. Nadal routed German qualifier Denis Gremelmayr 6-2, 6-2, while Federer overwhelmed Slovenia qualifier Grega Zemlja 6-2, 6-3. Federer won his 19th straight match dating to his U.S. Open semifinal loss to top-ranked Novak Djokovic. Federer and Nadal were joined by the sixth-ranked Jo-Wilfried Tsonga, who saved two set points in the first set before defeating Flavio Cipolla of Italy 7-6 (8), 6-3. Nadal will face Mikhail Youzhny of Russia, while Federer will play Andreas Seppi of Italy. Tsonga will face Albert Ramos of Spain.

From wire reports