Ranking Reaction: Top 10 debuts for Jannik Sinner, Anett Kontaveit; Barbora Krejcikova up to No. 3

Two players who've been absolutely lethal on indoor hard courts since the US Open—Jannik Sinner and Anett Kontaveit—make their Top 10 debuts today.

After a semifinal showing in Vienna, Sinner rises from No. 11 to No. 9 on the ATP rankings, not only becoming the first man born in the 2000s to reach the Top 10, but also the fifth Italian man into the Top 10 since ATP rankings began in 1973.

The first four Italian men to do it were Adriano Panatta (career-high No. 4), Corrado Barazzutti (career-high No. 7), Fabio Fognini (career-high No. 9) and Matteo Berrettini (currently at a career-high No. 7).

Sinner has gone 11-1 on indoor hard courts since the US Open, winning two ATP 250 titles at Sofia and Antwerp before reaching the semifinals of the ATP 500 in Vienna this past week (where he fell to Frances Tiafoe).

Meanwhile, someone on an even hotter streak this fall, Kontaveit, jumps from No. 14 to No. 8 after winning the Transylvania Open in Cluj-Napoca, Romania.

Kontaveit, who’s 15-0 on indoor hard courts since the US Open—winning two WTA 500s in Ostrava and Moscow, then the WTA 250 in Cluj-Napoca—is the first Estonian woman to break into the Top 10 since WTA rankings began in 1975.

There are no other Top 10 debuts on this week’s rankings, but there is one Top 20 debut—although she didn’t play this past week, American Jessica Pegula rises from No. 21 to No. 20 after Simona Halep dips down from No. 18 to No. 22.

There are a slew of other new career-highs in and around the upper echelon of both the ATP and WTA rankings this week, as well.

For the men, Indian Wells champion Cam Norrie rises from No. 14 to a new career-high of No. 13, while Australian Open semifinalist Aslan Karatsev goes from No. 19 to a new personal best of No. 16. Spanish teenager Carlos Alcaraz also sets a new high after a semifinal run in Vienna, jumping from No. 42 to No. 35.

There are three more new career-highs among the Top 10 women: Roland Garros champion Barbora Krejcikova inches up from No. 4 to No. 3; Roland Garros and US Open semifinalist Maria Sakkari rises from No. 7 to No. 6; and Tunisian trailblazer Ons Jabeur sneaks up from No. 8 to No. 7. And just outside the Top 10, Indian Wells winner Paula Badosa moves up from No. 13 to a new personal best of No. 11, while Anastasia Pavlyuchenkova rises from No. 14 to No. 12, finally surpassing the previous career-high of No. 13 she first reached over a decade ago, in July 2011.

And last but certainly not least, US Open champion Emma Raducanu goes from No. 23 to a new high of No. 21 after reaching the second tour-level quarterfinal of her career in Cluj-Napoca. Her first came in Flushing Meadows.