Serena: I don't get enough credit for being nice

Serena Williams explained why she apologized to Samantha Stosur after she lost a Hawk-Eye challenge at Miami’s Sony Ericsson Open. Williams won the match in straight sets. In the 2011 U.S. Open final, which she lost to Stosur, Serena got into a confrontation with chair umpire Eva Asdaraki.

"I always do kinda out of habit," Serena told reporters about the Hawk-Eye apology. "I don't mean to. I don't get enough credit for being a super nice person and clapping on good points. They only focus on me yelling at umpires. I'm actually an unbelievable professional competitor out there."