Spain's Rafael Nadal retained the number one spot in the men's Association of Tennis Professionals (ATP) world singles rankings released on Monday with 7,660 points.

Tennis rankings: Rafael Nadal, Simona Halep retain top spots

The women's tennis season concludes at the WTA Finals in Singapore next week and, like a majority of tournaments during the 2018 campaign, picking a winner from a wide-open field seems a near impossible task.

Caroline Wozniacki seeks repeat at wide-open WTA Finals

Simona Halep remained atop of the Women's Tennis Association rankings released on Monday with 7,421 points. French Open Champion Halep will finish the year as women's world number one for the second season in a row.

Simona Halep remains on top of world tennis rankings

World number one Simona Halep's participation in this month's WTA Finals was thrown into doubt after a scan on Tuesday revealed she had suffered a herniated disc in her back.

Simona Halep suffers herniated disc

World number one Simona Halep is out of the China Open at the first hurdle, retiring with back trouble after losing the first set 6-1 to Ons Jabeur on Sunday. The Romanian's tournament lasted just 31 miserable minutes in Beijing and she never looked comfortable against the Tunisian qualifier.

Simona Halep retires hurt from China Open

The China Open tennis tournament was set to kick off on Sunday with the some of the world's biggest names in the female lineup, while some of the heavyweights of the men's competition withdrew.

China Open kicks off with star-studded female lineup

World number one Simona Halep was defeated in straight sets by Dominika Cibulkova at the Wuhan Open in China. The sparse crowd watching the late-night clash was stunned as Halep failed to win a single game against the hard-hitting Cibulkova in the first set.

World No.1 Simona Halep knocked out of Wuhan Open

Simona Halep believes this year's French Open victory has helped justify her position as the women's world number one, with the Romanian saying she was now playing pressure-free tennis and motivated to add more Grand Slam titles to her resume.

Simona Halep feels Grand Slam triumph justifies number one ranking

The 2018 French Open women's singles final is set, world number one Simona Halep will face US Open champion Sloane Stephens

French Open: Sloane Stephens, Simona Halep to meet in women's singles final

Simona Halep, who had lost her three previous major finals, went a set and a break down at Roland Garros

Tennis: Simona Halep shrugs off Stephens challenge to win French Open title

Simona Halep reached her third French Open final with a 6-1, 6-4 victory over former champion Garbine Muguruza

World number 1 Simona Halep into third French Open final

World number one Simona Halep won a bruising quarter-final battle against Germany's Angelique Kerber 6-7(2) 6-3 6-2 to book a place against Garbine Muguruza in the French Open semis

French Open: Simona Halep survives grueling battle against Angelique Kerber to enter semi-final

World number one Simona Halep blazed into the French Open quarter-finals by crushing Belgian Elise Mertens 6-2 6-1

French Open: Simona Halep, Daria Kasatkina enter quater-finals

The Romanian had to battle for an hour to take the opening set

French Open: Halep subdues Petkovic after tight early tussle

Serena Williams battled back from a set and break down to defeat Australia's Ashleigh Barty 3-6, 6-3, 6-4 to reach the French Open third round on Thursday.

French Open: 'Serena came out' - Williams fights back as Nadal, Sharapova cruise

World number one Simona Halep battled back after a disastrous opening set to beat Alison Riske 2-6, 6-1, 6-1 in their delayed French Open first-round match

Simona Halep survives first-round of Roland-Garros, beats Alison Riske 2-6, 6-1, 6-1

Elina Svitolina successfully defended her Italian Open title on Sunday with a dominant 6-0 6-4 victory over an out-of-sorts Simona Halep

Italian Open: Elina Svitolina outplays Simona Halep to defend title

Austrian Dominic Thiem, last week's Madrid finalist, crashed at the first hurdle at Italian Open and top women's seed Simona Halep demolished Japan's Naomi Osaka

Thiem crashes in Rome, Halep demolishes Osaka

Rafael Nadal broke John McEnroe's 34-year record on Thursday by winning his 50th consecutive set on clay at the Madrid Open

Rafael Nadal breaks McEnroe record in Madrid but Del Potro, Sharapova, Halep crash out

World number one Simona Halep trounced Elise Mertens to reach the third round of the Madrid Open

Simona Halep eases past Mertens to enter 3rd round of Madrid Open

American CoCo Vandeweghe shocked world number one Simona Halep 6-4 6-1 on Friday to move into the semi-finals of the Porsche Tennis Grand Prix in Stuttgart

Tennis: CoCo Vandeweghe stuns world munber one Simona Halep to advance to semi-finals

World No. 44 Osaka stormed past the top-seeded Halep in stunning fashion with a 6-3, 6-0 win

Naomi Osaka ousts Simona Halep to enter finals of Indian Wells

Japan's Naomi Osaka outplayed fifth-seeded Karolina Pliskova to book a berth in the semi-final

Simona Halep to face Japan's Naomi Osaka in semi-final of Indian Wells

Wozniacki won 7-6 (7/4), 1-6, 6-3 against Germany's Angelique Kerber to progress to the last four

Halep injury woe continues as Wozniacki marches on in Qatar

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