Madison Keys is an American professional tennis player. She has been ranked as high as world No. 7 by the Women's Tennis Association (WTA), which she first achieved in October 2016. Keys has contested a Major singles final at the 2017 US Open, competed at the 2016 WTA Finals, and was a semifinalist at the 2016 Rio Olympics. She has won seven WTA Tour tournaments, six of which were at the Premier level, and won her biggest title at the 2019 Cincinnati Open, a Premier 5 event.

The WTA rankings are the ratings defined by the Women's Tennis Association, introduced in November 1975. The computer that calculates the ranking is nicknamed "Medusa".