Rankings Update: Halep drops to world No. 3; Federer down to No. 6

Rankings Update: Halep drops to world No. 3; Federer down to No. 6

Meanwhile, Osaka is the new world No. 1 and Sabalenka is into the Top 10 for the first time.

Naomi Osaka has become the first tennis player from Asia to reach No. 1 in the singles rankings, securing the top spot by winning the Australian Open.

"I’m beyond excited to become the new WTA world No. 1," Osaka said in a statement from the WTA tour. 

The Aussie Open title was Osaka's second major in a row, with the 21-year-old having also won the US Open. 

There was plenty of other movement within the WTA Top 10, with several players tightly grouped together coming into the tournament. Petra Kvitova got back to a career-high No. 2 by reaching the Melbourne final, rising four spots, while semifinalist Karolina Pliskova climbed three spots to No. 5 in the rankings. Aryna Sabalenka entered the Top 10 for the first time, despite a third-round exit at the Australian Open.

On the other hand, Simona Halep, who entered the tournament as No. 1, fell to No. 3 and 2018 champion Caroline Wozniacki dropped to No. 9 in the rankings.

And just below, Serena Williams climbed back up to No. 11, while semifinalist Danielle Collins entered the tournament No. 35 but is now No. 23 in the rankings.

WATCH—ATP Rankings Update:

There was also some movement in the ATP Top 10, mostly from players dropping points. 

Federer dropped three spots to No. 6 following his fourth-round exit at the Australian Open, while 2018 finalist Marin Cilic also fell three spots to No. 10 in the ATP rankings.

But there were some upward moves just below, with Stefanos Tsitsipas
rising three spots to No. 12 and Lucas Pouille going up 14 spots to No. 17 in the rankings. Both players reached their first Grand Slam semifinal at Melbourne.

Australian Open champion Novak Djokovic and finalist Rafael Nadal stayed at No. 1 and No. 2 in the rankings.

This Week on Tennis Channel Plus:

WTA St. Petersburg: Starting Monday, Jan. 28 at 5 a.m. ET, catch live coverage of the St. Petersburg Ladies Trophy featuring Australian Open finalist Petra Kvitova and Maria Sharapova.

WTA Hua Hin: Top seed Garbine Muguruza headlines the field from Hua Hin. Watch every match of the Thailand Open, starting Monday, Jan. 28 at 3 a.m. ET.