Williams will face Latvia's Ostapenko at the Mubadala World Tennis Championship in the first tournament of the year that women will take part in, the organizers announced on Sunday.
Hyderabad Hunters' star shuttler Carolina Marin justified her World No. 3 billing by defeating Michelle Li 15-9, 15-11.
Last month, Nadal had announced the withdrawal from the ATP finals citing a knee injury after he was defeated by Belgium's first-time qualifier David Goffin in the opening match.
Ramanathan (142) comes to the main draw at the back of winning three titles in ITF Futures event.
Indian tennis moved at its usual pace as there was neither great success nor depths of despair. It just hung in the middle, thanks to unswerving spirit of the youngsters.
Nadal is slated to make a comeback at the Mubadala World Tennis Championship in Abu Dhabi, beginning December 29.
Bopanna and Nedunchezhiyan had formed a lethal combination to edge past Sharan and Raja earlier this year to win the Chennai Open title.
On June 9, Williams was involved in a car collision with Jerome Barson and his wife near Palm Beach Gardens, Florida.
Bartoli has won eight WTA Tour titles during her career, with the highest WTA ranking at No. 7 in 2012.
The Indian tennis legend also stressed on the fact that we need good singles players if India want to do well in Davis Cup World Group as the top players take part and have to look beyond only doubles events.
The former world number has not played any competition for a long time and is likely to make a comeback in Melbourne for the first time since giving birth to a baby girl in September.
Sania won the 2016 Australian Open women's doubles title with Martina Hingis before announcing their split in August.
Azarenka, who won the Australian Open in 2012 and 2013, has been involved in a custody dispute involving her son Leo, who was born last Dec. 19.
In the past, tennis legends like Boris Becker, Stanislas Wawrinka, Carlos Moya, Marin Cilic and Rafael Nadal have competed in the tournament which has been renamed as Maharashtra Open.
O'Shannessy will join Andre Agassi and recently-retired Radek Stepanek of the Czech Republic in Djokovic's new-look coaching team.
The former world number one is planning to come out of retirement and "give it a real crack" with compatriot Sam Groth in the men's doubles event of the first major of the 2018 season.
The Swiss maestro, who chose to sit out the second half of 2016 in order to recover fully from his knee surgery as well as a back problem, made a stunning return in 2017 to rise No. 2 spot in the ATP Rankings.
In September, Serena had revealed that she had set an 'outrageous' goal for making a comeback at the Australian Open.
It is the first time since 1998 that the men's and women's ITF world champions hail from the same country.
Tournament director Craig Tiley is optimistic that she would return for a crack at her seventh Melbourne Park crown.
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