The new tennis season is just five days away, and we're counting down to first serve with 10 burning questions.

Sixth: The semifinals of the women's US Open tournament was entirely comprised of Americans—and not one of them was Serena Williams. With Serena rejoining Sloane Stephens, Madison Keys, CoCo Vandeweghe and her sister, Venus, this season, which American women will fare best in 2018?

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10 Burning Questions for 2018: Which American woman will fare best?

10 Burning Questions for 2018: Which American woman will fare best?

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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.