World No. 1 Serena Williams tells the Miami Herald that she doesn't consider any other players threats to her. Williams, who is competing in Miami this week, lost the last that she played to now-No. 3 Victoria Azarenka in the Doha final; it was only the second time that the Belarusian had beaten her in 13 meetings.

Williams said that it’s “one of the good rivalries because we don’t hate each other. We have respect for each other and enjoy the battle.”

However, Williams said she is not threatened by Azarenka or other opponents.

“I didn’t call her a threat. I wouldn’t use that word. That’s your word,” Williams said. “There are other good players, but I wouldn’t call them threats.”

Williams also said that occasionally losing matches serves as major motivation.

“I enjoy it more and more the older I get,” Williams said. “I feel like I’m a kid still learning, like I can still get better. Losing motivates me. Sometimes, I hate to say this, but it’s good for me to lose because I can’t tell you how much that motivates me. All I can think of is that loss. It keeps me human.’’