Today's top sports stories:

NASCAR driver Denny Hamlin is refusing to pay a fine for his comments regarding the new Generation 6 cars. Said Hamlin: "I'm not going to pay the fine. If they suspend me, they suspend me. I don't care at this point." [USA Today]

The New York Yankees' Mariano Rivera, widely regarded as the best closer of all time, will announce his intention to retire following the 2013 season. The 43-year-old missed last season due to a knee injury. [N.Y. Times]

With recent injuries to power hitters Curtis Granderson and Mark Teixeira, plus numerous off-season free-agent losses, the Yankees could be in trouble this year in a stacked A.L. East. Some are saying they might fall below .500 for the first time since 1992. [Grantland]

Professional tennis will begin using something called a Biological Passport to stop players from using performance-enhancing drugs. The sports top players, including Roger Federer and Andy Murray, have called for stricter testing. [BBC]

Maybe they should call it the Scorpion League, rather than the Cactus League. In one of the stranger spring training injuries we've heard of, Milwaukee Brewers G.M. Doug Melvin was stung by one of the dangerous desert insects at his condo in Arizona. [GuySpeed]

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