Caroline Wozniacki will be looking to carry the momentum of a strong end to the season through to a second successive WTA Finals title triumph next week. But it will be better for my health. Halep sustained the injury - a herniated disc - in training last month and hasn't practised or played tennis in the last four weeks.
Halep withdrew from the Kremlin Cup this week as she continues to be troubled by the injury and is taking no risks.
Over the years, Tennis Cambodia has seized upon this chance to send out emerging talent to expose them to the rigours of competition, which is also once-in-a-lifetime chance to meet the game's best and the greatest in friendly settings and also get a taste of how hard these top professionals train and compete.
Interestingly, her last win of the season came in the semi-final of Cincinnati, losing the title match to Kiki Bertens and wrapping up the season with for straight losses.
"I wanted to finish 2018 on a high after such an incredible year, but sadly my back injury hasn't healed the way we hoped it would and I need to put my long-term health first".
In her absence, Bertens, who finished ninth in the Race to Singapore standings, will be making her WTA Finals debut in the last version of the tournament in Singapore after a five-year run in Southeast Asia. "So I am definitely sad to see it go, but at the same time, it's had any awesome run and the five years, I think they have done an incredible job". I'm not ready to compete at this level and I'm still sore. The draw ceremony for the BNP Paribas WTA Finals Singapore will be held on Friday, October 19.
"Singapore is a special city and I'm sure the fans will enjoy seeing some fantastic women's tennis this week".
Angelique Kerber, Naomi Osaka, Petra Kvitova, Sloane Stephens, Karolina Pliskova, Elina Svitolina and Kiki Bertens are the other seven women competing in the $7 million event.