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12 things you should know about 19-year-old American Madison Keys

MELBOURNE -- 19-year-old Madison Keys advanced to her first ever Slam quarterfinal after defeating Madison Brengle 6-2, 6-4 at the Australian Open on Monday. The American teen, who is now under the guidance of three-time Slam champion Lindsay Davenport, credits her new coach and improved fitness for her great run in Melbourne, which includes her defeat of reigning Wimbledon champion Petra Kvitova in straight sets in the third round. Get to know the affable American, who has made everyone sit up and take notice.