How long can the world No. 1 keep her unbeaten run going after arriving to the Foro Italico with a 23-match win streak in hand?

The two-time Grand Slam finalist and former No. 1’s first win in Charleston on Wednesday was also her first win since returning to the tour from a right hand injury.

Tributes from current and former WTA & ATP players and coaches poured in for the 25-year-old Australian, who revealed on Instagram she is hanging up her racquet.

The Czech has withdrawn from next month’s Australian Open and two warm-up tournaments because of an injury sustained in training.

With a varied game and a sporting style, the world No. 1 brought a Wimbledon singles title back to Australia for the first time in 19 years, in an entertaining and nerve-wracking championship clash.

In a rare overlap, the tours’ Finals share space through the start of the week, ending with the guarantee of an all-Spanish WTA Finals semifinal.

The Estonian qualified for the semifinals of the WTA Finals, and is playing better than anyone in the game right now.

Group Teotihuacán returns to action Friday in Guadalajara, as Karolina Pliskova and Anett Kontaveit battle in the day session before Barbora Krejcikova faces Garbiñe Muguruza at night.

"When I found out that the Finals were going to be here, I felt very happy because the environment," the world No.5 said.

With an 8-6 tiebreaker triumph, the Czech defeated the only other player in this season-ending championships that has previously played in one.