When Serena Williams defeated her sister, Venus, in the Australian Open final, that was just Serena doing what she does best. It gave Serena, widely considered to be the greatest female tennis player ever, her 23rd Grand Slam singles title.

But that wasn't Serena's biggest milestone of 2017. On September 1, Williams gave birth to her first child, Alexis Olympia Ohanian Jr. Two and a half months later, she married Reddit co-founder Alexis Ohanian in a beautiful wedding in New Orleans, with many celebrities in attendance.

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It will be tough to top 2017 for Serena, but if there's anyone who can...

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Friday, December 29: Novak Djokovic begins his comeback at the Mubadala World Tennis Championship in Abu Dhabi against either Roberto Bautista Agut or Andrey Rublev.

Not before 10:00 a.m. ET LIVE on Tennis Channel Plus. GET PLUS NOW at tnns.ch/TCPlus

Saturday, December 30: Roger Federer looks to continue his remarkable resurgence at the Hopman Cup in Perth in singles and mixed doubles competition.

4:30 a.m ET LIVE on Tennis Channel Plus. GET PLUS NOW at tnns.ch/TCPlus

Saturday, December 30: Serena Williams returns at the Mubadala World Tennis Championship in Abu Dhabi, in her first match since the birth of her first child, against the 2017 French Open champion, Jelena Ostapenko.

8:00 a.m ET LIVE on Tennis Channel. Additional airings at 2:00 p.m., 8:00 p.m. and 11:30 p.m. ET.