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.

Sofia Anna "Sonya" Kenin is an American professional tennis player. She has a career-high ranking by the WTA of No. 4 in the world, which she achieved on March 9, 2020. She was the 2020 WTA Player of the Year, an award she earned by winning the 2020 Australian Open and finishing runner-up at the 2020 French Open. Kenin has won another four singles and four doubles titles on the WTA Tour, including the 2019 China Open and 2024 Miami Open at the WTA 1000-level with Bethanie Mattek-Sands.