Coco Gauff and Alycia Parks meet in an all-American encounter that pits a settled elite player against a power seeker. Parks, 25, and Gauff, 22, present a contrast: Gauff has been embedded in the Top 5 for three years, while Parks is still searching for a consistent breakthrough. Parks carries physical tools — listed at 6’1 and capable of hitting with anyone — and she owns a title and a career-high ranking as high as No. 40. She can also hit rough patches: she is currently ranked 105th and went 23-32 in 2025. Her only prior meeting with Gauff ended 6-0, 6-2.

Parks arrives in Miami on a recent high: she has won two main-draw matches here and handled former WTA No. 2 Maria Sakkari 6-3, 6-3 on Friday. The quick courts could favor Parks’ ability to tee off, but Gauff’s pace, court coverage and refusal to relent often allow her to extend rallies until she finds the extra ball she needs. Winner: Gauff

Jannik Sinner follows an Indian Wells title run and was fortunate that Miami’s opening day was rained out and his side of the draw played last. That timing gives him a first match on Saturday, six days after Indian Wells concluded. He said Miami was “very important” to him and appears ready to resume competition. Last year he served a doping-related suspension and has little to defend until Rome in May.

Sinner’s first opponent is the 33-year-old, 76th-ranked Dzumhur. The Italian will prepare carefully; on paper Dzumhur is 3-7 this season and at 5’9 he gives up about six inches to Sinner. He is not likely to bring a booming serve or great power, and at 33 he is not as quick as before, but he will battle for every game. Winner: Sinner

Emma Gibson’s story is momentum-driven. The 21-year-old Australian won two qualifying matches in Indian Wells, beat three Top 20 opponents to reach that quarterfinal run, and in Miami she won two more qualies and steamrolled Sara Bejlek 1 and 0 in the first round. She now faces Naomi Osaka, who is 17-8 in Miami with a final-round appearance in 2022 and who reached two wins at Indian Wells before bowing to Aryna Sabalenka. Osaka brings experience and a lethal forehand; Gibson brings form and a two-handed backhand that has carried her so far this spring.