The 2021 Miami Open was a professional hardcourt tennis tournament played from March 23 to April 4, 2021, on the grounds of Hard Rock Stadium in Miami Gardens, Florida. The 36th edition of the Miami Open, it was a Masters 1000 event on the 2021 ATP Tour, and a WTA 1000 event on the 2021 WTA Tour. The 2020 edition was postponed due to the onset of the COVID-19 pandemic in Florida.[1]
Due to COVID-19 restrictions, capacity for each session was limited to 800–1,000 spectators, and spectators were only admitted in the three largest courts on the site; Hard Rock Stadium itself was not used.[2] Roger Federer and Ashleigh Barty were the defending champions from 2019 in the men's and women's singles respectively. Barty successfully defended her title, defeating Bianca Andreescu in the final, 6–3, 4–0, retired. Federer did not attend the tournament.[3]
Hubert Hurkacz def. 
Jannik Sinner 7–6(7–4), 6–4..svg/1280px-Flag_of_Australia_(converted).svg.png){kind=small}
Ashleigh Barty def. .svg/1280px-Flag_of_Canada_(Pantone).svg.png){kind=small}
Bianca Andreescu 6–3, 4–0 ret.
Nikola Mektić / Mate Pavić def. 
Dan Evans / Neal Skupski 6–4, 6–4.
Shuko Aoyama / Ena Shibahara def. 
Hayley Carter / 
Luisa Stefani, 6–2, 7–5.* Players with byes receive first round points.
The following are the seeded players. Seedings and ranking points based on ATP rankings as of March 22, 2021.