Garbiñe Muguruza poses with the WTA World No.1 trophy before the start of the Toray Pan Pacific Open in Tokyo. (Getty Images)

Muguruza and the WTA World No.1 trophy

Brand new No.1 Garbiñe Muguruza, the second Spaniard to hold the position, won Roland Garros in 2016 and is the reigning Wimbledon champion (Getty)

From Evert to Muguruza: All 24 WTA World No.1s

Date’s breakthrough came at the 1994 Australian Open, when she reached the first of three career Grand Slam semifinals.

10 greatest moments: Kimiko Date

Timea Babos defeated Jamie Loeb 7-6(4), 5-7, 6-2 to progress to the round of 16 in the Coupe Banque Nationale

Quebec in pictures: Babos moves through

Sloane Stephens took her US Open trophy to Central Park on Sunday. (Getty)

Sloane Stephens and the US Open trophy

Madison Keys celebrates her win (Getty)

Story of the semifinal: Majestic Madison beats CoCo

Sloane Stephens celebrates beating Venus Williams (Getty)

Story of the semifinal: Sensational Stephens defeats Venus

Madison Keys knew victory would complete an All-American quartet in the last four (Getty)

Story of the quarterfinal: Keys raises the States

CoCo Vandeweghe sends in an early return during the quarterfinal against Karolina Pliskova (Getty)

Story of the quarterfinal: CoCo claims last four spot

Sloane Stephens looks to the sky after beating Anastasija Sevastova (Getty)

Story of the quarterfinal: Stephens sees off Sevastova

Williams clenches her fist (Getty)

Story of the quarterfinal: Venus rises

Madison Keys celebrates after beating Elina Svitolina (Getty)

US Open in pictures: Keys cruises on