In sum, no 20-something appears poised to wrest the mantle from the 30-somethings who have dominated the sport for so long.
Miami Open: Tournament offers a glimpse of what tennis could look like without Big 3, Serena Williams
Miami Open offered a glimpse into what tennis could look like when Roger Federer, Rafael Nadal, Novak Djokovic and Serena Williams retire and it was still scintillating.
The 24-year-old Hurkacz won the biggest title of his career by beating 19-year-old Jannik Sinner of Italy 7-6 (4), 6-4 on Sunday.
Barty, the 2019 French Open champion, has held the No 1 ranking since September of that year, despite skipping the rescheduled US and French Opens in 2020 to remain in Australia.
Barty won her second successive Miami title, and the Australian was already in control of the match when Andreescu turned her right foot while hitting a forehand and sprawled to the hard court.
Sinner, who reached last year's French Open quarter-finals, defeated Bautista 5-7, 6-4, 6-4 to become only the fourth teen to reach the men's final in the 36-year history of the ATP Miami Masters.
Barty, who is assured of retaining her No 1 ranking next week, will play for the title Saturday against the winner of the second semi-final between No 8 Bianca Andreescu and No 23 Maria Sakkari.
Thiem lost in the last 16 of the Australian Open in February and suffered early exits at both Doha and Dubai.
Seventh-seeded Spaniard Roberto Bautista Agut beat Medvedev 6-4, 6-2, for his third win in as many meetings with the Russian.
Miami Open: Maria Sakkari ends Naomi Osaka's winning streak to reach semi-finals; Andreescu advances
Osaka broke in the second game of the second set and seized a 3-0 lead before Sakkari roared back to seal a semi-final spot in the prestigious ATP Masters and WTA hardcourt tournament.
Miami Open: Ashleigh Barty reaches semis after hard-fought win over Aryna Sabalenka; Daniil Medvedev into last eight
Meanwhile, Jannik Sinner downed Emil Ruusuvuori 6-3, 6-2 to advance to the last eight.
The three-time Grand Slam winner, 33, told the Gentleman's Journal there was "crossover" between the two sports and he could make a difference.
Aryna Sabalenka, Elina Svitolina, Andrey Rublev, Diego schwartzman expressed uncertainty about taking the COVID-19 vaccine shot.
Miami Open: Naomi Osaka, Ashleigh Barty, Bianca Andreescu in quarter-finals; Stefanos Tsitsipas into last-16
The world's top-ranked player Ashleigh Barty has reached the Miami Open quarter-finals, getting there by holding off 14th-seeded Victoria Azarenka of Belarus 6-1, 1-6, 6-2
Medvedev failed to convert three match points in the second set after taking a 5-2 lead. An hour later the Russian was still playing, and on a humid afternoon with temperatures in the mid 80s, he paid a price.
Second-ranked Osaka, the reigning US and Australian Open champion, will next face the winner of a later match between 16th seed Elise Mertens and 22nd-seeded Anett Kontaveit.
Defending champion Barty defeated the former French Open champion from Latvia 6-3, 6-2 to set up a fourth-round clash with former world number one Victoria Azarenka.
Thirteen aces among her 36 winners helped Osaka overcome a slew of unforced errors of her own and set up a third-round meeting with Serbian qualifier Nina Stojanovic, who surprised Yulia Putintseva
The top-ranked Barty rallied from a big third-set deficit and overcame a match point to win her opening match against qualifier Kristina Kucova, 6-3, 4-6, 7-5.
Pospisil pulled himself together to win the second set, but McDonald, ranked 120th in the world, bounced back to seal the match and set up a second-round meeting with 18th-seeded American John Isner.