Sunday’s match between No. 37-ranked Hubert Hurkacz and No. 31 Jannik Sinner was the first ATP Masters 1000 final since 2003 with two players ranked outside the top 30.
The 26th-seeded Hurkacz, who had eliminated four higher-ranked players en route to the final, held his nerve at Miami's Hard Rock Stadium to win 7-6 (7/4), 6-4 in 1hr 43min.
No.5 seed Elina Svitolina of Ukraine needed nearly 2.5 hours to beat ninth-seeded Petra Kvitova of the Czech Republic 2-6, 7-5, 7-5 and earn her ticket to the quarterfinals.
It is a complicated way of calculating things, but in general, rankings points will remain part of a player's total for a minimum of a year and not more than two years.
It has been 20 years since Venus Williams won her home tournament, and her stay at the 2021 Miami Open was brief.
Miami Open tournament director James Blake said he hopes Federer will return in 2021 to an event he has won four times, including two years ago.
Juan Martin del Potro sent his devoted fans home happy by powering into the ATP Miami Open quarter-finals with a 6-4, 6-2 triumph over Serbian Filip Krajinovic.
American Sloane Stephens had cause for a double celebration after beating Germany's Angelique Kerber 6-1, 6-2 to reach the WTA Miami Open semi-finals.