The 36-year-old has not played since clinching a 23rd Grand Slam singles title 11 months ago, after revealing she was pregnant during the tournament and taking time off to give birth to her first child, Alexis Olympia in September.
Latvian Ostapenko, whose match against Williams will be the first between women to be played at a tournament first staged in 2009, said: "It is a huge honour to be part of that history". I look forward to seeing the fans in Abu Dhabi at the 10th Edition of the Championship very soon', the 23-time Grand Slam victor said.
It will be the first time in 10 years that a women's tennis match has taken place at the Mubadala World Tennis Championships, and will come as a major boost for fans in the region following last week's high-profile withdrawals of Rafael Nadal, Stanislas Wawrinka and Milos Raonic.
The Mubadala World Tennis Championships will take place between 28-30 December.
. On December 30, as well as 29, fans will be able watch also the 12-time Grand Slam victor Novak Djokovic, who will face Andrey Rublev or Dominic Thiem in the semifinals and then will play the third or first place final.
Ranked 22nd in the world, she would not need a wildcard.
Day 1 of the tournament, on Thursday, will host the men's quarter-final matches, with Carreno Busta and Anderson first on court at 5pm, followed by Bautista Agut against Rublev.
Haley: The US Will Remember Today's UN Vote
Responding to the vote, Prime Minister Benjamin Netanyahu stated that "Israel completely rejects this preposterous resolution". Before the vote, Haley threatened that the resolution could lead to the US pulling funding from the United Nations .
Several people killed in Bartow plane crash
Polk County Sheriff's deputies said the twin-engine plane crashed at the end of the runway near Ben Durrance Road in Bartow. The Polk County Sheriff's Office is handling the death investigations, deputies said.
$3.20 EPS Expected for The Sherwin-Williams Company (SHW)
It is negative, as 60 investors sold SHW shares while 210 reduced holdings. 100 funds opened positions while 297 raised stakes. London Of Virginia reported 1,610 shares. 26,807 were accumulated by State Board Of Administration Of Florida Retirement Sys.