WTA

SINGAPORE - OCTOBER 25: Caroline Wozniacki of Denmark celebrates victory in her singles match against Simona Halep of Romania during day 4 of the BNP Paribas WTA Finals Singapore presented by SC Global at Singapore Sports Hub on October 25, 2017 in Singapore. (Photo by Clive Brunskill/Getty Images)

Caroline Wozniacki secures semifinals spot at 2017 WTA Finals

Venus Williams survives, outlasts French Open champion

Karolina Pliskova stuns Venus Williams in WTA Finals Round 1

Simona Halep off to impressive start at 2017 WTA Finals

SINGAPORE - OCTOBER 21: Garbine Muguruza of Spain attends All Access Hour prior to the BNP Paribas WTA Finals Singapore presented by SC Global at Marina Bay Sands Hotel on October 21, 2017 in Singapore. (Photo by Matthew Stockman/Getty Images)

Garbine Muguruza named WTA singles player of the year

SINGAPORE - OCTOBER 20: Simona Halep of Romania walks in to the Official Draw Ceremony and Gala of the BNP Paribas WTA Finals Singapore presented by SC Global at Marina Bay Sands Hotel on October 20, 2017 in Singapore. (Photo by Clive Brunskill/Getty Images for WTA)

Simona Halep headlines Red Group at the 2017 WTA Finals

BEIJING, CHINA - SEPTEMBER 30: Kristina Mladenovic of France returns a shot against Ying-Ying Duan of China on day one of the 2017 China Open at the China National Tennis Centre on September 30, 2017 in Beijing, China. (Photo by Emmanuel Wong/Getty Images)

Kremlin Cup: round of 16 action riddled with upsets

BEIJING, CHINA - OCTOBER 04: Maria Sharapova of Russia returns a shot against Simona Halep of Romania during the Women's singles 3rd round on day five of 2017 China Open at the China National Tennis Centre on October 4, 2017 in Beijing, China. (Photo by Lintao Zhang/Getty Images)

Maria Sharapova: Tianjin title is preview of what to expect in 2018

BEIJING, CHINA - OCTOBER 04: Maria Sharapova of Russia returns a shot against Simona Halep of Romania during the Women's singles 3rd round on day five of 2017 China Open at the China National Tennis Centre on October 4, 2017 in Beijing, China. (Photo by Lintao Zhang/Getty Images)

Maria Sharapova notches another win in her return to tennis

BEIJING, CHINA - OCTOBER 08: Caroline Garcia of France holds the winner's trophy after winning the Women's Singles final against Simona Halep of Romania on day nine of the 2017 China Open at the China National Tennis Centre on October 8, 2017 in Beijing, China. (Photo by Etienne Oliveau/Getty Images)

Caroline Garcia completes Wuhan-Beijing title run, enters WTA top 10

BEIJING, CHINA - OCTOBER 07: Simona Halep of Romania poses with a bouquet after becoming world number one due to winning the Women's singles semifinals match against Jelena Ostapenko of Latvia on day eight of 2017 China Open at the China National Tennis Centre on October 7, 2017 in Beijing, China. (Photo by Lintao Zhang/Getty Images)

Simona Halep into China Open finals, becomes new world No. 1

BEIJING, CHINA - OCTOBER 01: Simona Halep of Romania attends an event in the Mercedes-Benz booth during day two of the 2017 China Open at the China National Tennis Centre on October 1, 2017 in Beijing, China. (Photo by Etienne Oliveau/Getty Images)

Simona Halep tops Maria Sharapova for the first time in her career

TORONTO, ON - AUGUST 8: Eugenie Bouchard of Canada plays a shot against Donna Vekic of Croatia during Day 4 of the Rogers Cup at Aviva Centre on August 8, 2017 in Toronto, Canada. (Photo by Vaughn Ridley/Getty Images)

Eugenie Bouchard continues to struggle, exits China Open early

BEIJING, CHINA - OCTOBER 02: Garbine Muguruza of Spain attends a press conference after her retired due to injury during the day three of 2017 China Open at the China National Tennis Centre on October 2, 2017 in Beijing, China. (Photo by Lintao Zhang/Getty Images)

Garbine Muguruza retires in Beijing opener, cites illness

WUHAN, CHINA - SEPTEMBER 26: Caroline Wozniacki of Denmark reacts during the match against Maria Sakkari of Greece on Day 3 of 2017 Dongfeng Motor Wuhan Open at Optics Valley International Tennis Center on September 26, 2017 in Wuhan, China. (Photo by Wang He/Getty Images)

Caroline Wozniacki qualifies for 2017 WTA Finals in Singapore

WUHAN, CHINA - SEPTEMBER 29: Caroline Garcia of France serves against Maria Sakkari of Greece on Day 6 of 2017 Dongfeng Motor Wuhan Open at Optics Valley International Tennis Center on September 29, 2017 in Wuhan, China. (Photo by Wang He/Getty Images)

Caroline Garcia completes comeback title win at Wuhan Open

BEIJING, CHINA - SEPTEMBER 30: Maria Sharapova of Russia returns a shot against Anastasija Sevastova of Latvia during their first round match on day one of the 2017 China Open at the China National Tennis Centre on September 30, 2017 in Beijing, China. (Photo by Etienne Oliveau/Getty Images)

Maria Sharapova survives opening round match at China Open

TOKYO, JAPAN - SEPTEMBER 23: Angelique Kerber of Germany looks on during her semi final match against Anastasia Pavlyuchenkova of Russia on day six of the Toray Pan Pacific Open Tennis At Ariake Coliseum on September 23, 2017 in Tokyo, Japan. (Photo by Matt Roberts/Getty Images)

Angelique Kerber faces uphill battle at 2017 China Open

WUHAN, CHINA - SEPTEMBER 29: Caroline Garcia of France returns a shot during the match against Maria Sakkari of Greece on Day 6 of 2017 Dongfeng Motor Wuhan Open at Optics Valley International Tennis Center on September 29, 2017 in Wuhan, China. (Photo by Wang He/Getty Images)

Wuhan Open: the finals are set at the Premier 5 tournament

TOKYO, JAPAN - SEPTEMBER 22: Garbine Muguruza of Spain serves in her quarter final match against Caroline Garcia of France during day five of the Toray Pan Pacific Open Tennis At Ariake Coliseum on September 22, 2017 in Tokyo, Japan. (Photo by Matt Roberts/Getty Images)

WTA Tour: world No. 1 ranking in play down the stretch

WUHAN, CHINA - SEPTEMBER 27: Garbine Muguruza of Spain reacts after winning the match against Magda Linette of Poland on Day 4 of 2017 Dongfeng Motor Wuhan Open at Optics Valley International Tennis Center on September 27, 2017 in Wuhan, China. (Photo by Yifan Ding/Getty Images)

Wuhan Open: two Grand Slam winners square off in quarterfinals

NEW YORK, NY - AUGUST 28: Simona Halep of Romania reacts against Maria Sharapova of Russia during her first round Women's Singles match on Day One of the 2017 US Open at the USTA Billie Jean King National Tennis Center on August 28, 2017 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)

Simona Halep, Caroline Wozniacki see early exits at Wuhan Open

TOKYO, JAPAN - SEPTEMBER 24: Caroline Wozniacki of Denmark poses with the winners trophy after defeating Anastasia Pavlyuchenkova of Russia in the women's singles final match on day seven of the Toray Pan Pacific Open Tennis At Ariake Coliseum on September 24, 2017 in Tokyo, Japan. (Photo by Matt Roberts/Getty Images)

Caroline Wozniacki defends Pan Pacific Open title

WUHAN, CHINA - SEPTEMBER 25: Sloane Stephens of USA returns a shot during the match against Qiang Wang of China Day 2 of 2017 Dongfeng Motor Wuhan Open at Optics Valley International Tennis Center on September 25, 2017 in Wuhan, China. (Photo by Wang He/Getty Images)

WTA Tour: Recapping the Summer of Sloane Stephens

TOKYO, JAPAN - SEPTEMBER 20: Garbine Muguruza of Spain plays a forehand in her match against Monica Puig of Puerto Rico during during day three of the Toray Pan Pacific Open Tennis At Ariake Coliseum on September 20, 2017 in Tokyo, Japan. (Photo by Koji Watanabe/Getty Images)

Garbine Muguruza: world No. 1 rolls into Tokyo quarterfinals

NEW YORK, NY - SEPTEMBER 09: Sloane Stephens of the United States poses with the championship trophy during the trophy presentation after defeating Madison Keys of the United States in the Women's Singles final match on Day Thirteen during the 2017 US Open at the USTA Billie Jean King National Tennis Center on September 9, 2017 in the Queens borough of New York City. (Photo by Chris Trotman/Getty Images for USTA)

Sloane Stephens experiences meteoric rise in WTA Tour rankings

NEW YORK, NY - AUGUST 30: Timea Babos of Hungary returns a shot against Maria Sharapova of Russia during their second round Women's Singles match on Day Three of the 2017 US Open at the USTA Billie Jean King National Tennis Center on August 30, 2017 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Clive Brunskill/Getty Images)

Timea Babos reaches quarterfinals at Coupe Banque Nationale

NEW YORK, NY - SEPTEMBER 07: Sloane Stephens (R) of the United States shakes hands with Venus Williams (L) of the United States in their Women's Singles Semifinal match on Day Eleven of the 2017 US Open at the USTA Billie Jean King National Tennis Center on September 7, 2017 in the Flushing neighborhood of the Queens borough of New York City. Sloane Stephens defeated Venus Williams in 3 sets with a score of 6-1, 0-6, 7-5. (Photo by Al Bello/Getty Images)

US Open 2017: Sloane Stephens advances to first Grand Slam final