Rafael Nadal headlines the list of players expected to compete at the 2019 Mexican Open in the Pacific resort city of Acapulco.
Simona Halep played two Grand Slam finals winning the French Open crown and won titles in Shenzhen and Montreal.
Djokovic climbed one spot up to second after claiming the Shanghai Masters title for the fourth time in a row.
Juan Martin Del Potro, the US Open runner-up to Novak Djokovic this year, hobbled out of the Shanghai Masters last 16 against Borna Coric on Thursday.
Novak Djokovic has now been victorious in 18 ATP matches in a row and in recent months won Wimbledon, the Cincinnati Masters, the US Open and now Shanghai for a fourth time.
Novak Djokovic and Borna Coric kept fans on the edge of their seats with an incredible rally during the first set.
Sania Mirza shared the image on her official Twitter account.
Roger Federer has not been at his best all week, dropping sets in the two opening matches of his wobbly title defence.
Wang Qiang wrapped up the biggest win of her season on Saturday after an overnight rain delay forced her to wait to claim victory over Elina Svitolina.
Taking to her official Twitter account, a miffed Sania Mirza had some words of advice for people giving her advice on pregnancy.
Novak Djokovic is in sparkling form, winning Wimbledon, the Cincinnati Masters and US Open in recent months, after having elbow surgery in February.
Earlier this week, Fernando Verdasco had berated a ball boy at the Shenzhen Open for failing to bring his towel fast enough.
The 17-time Grand Slam champion has also given shelter to the flood victims in his tennis academy.
The Serbian second seed beats Marco Cecchinato, whom he had lost to in the French Open quarter-finals earlier this year.
The hilarious incident that took place during a Shanghai Masters match was caught on camera and quickly went viral.
Roger Federer was given a huge scare before finally seeing off Russia's Daniil Medvedev to open his Shanghai Masters defence in unconvincing fashion.
Fernando Verdasco has not commented on the incident when he aggressively gesticulated at a ball boy to hurry up during last month's Shenzhen Open in China.