WTA Top 10 injury woes continue at tune-ups; Djokovic cruises in Doha

Overnight results from Brisbane, Auckland, Doha: Novak Djokovic cruises, Garbine Muguruza retires with injury, Serena Williams withdraws from Hopman Cup, more.

Check out some of the headlines and results from the top tournaments around the world that you may have missed while you were sleeping.

Yet another WTA Top 10 early exit

The season is just a few days old and we've already seen almost all of the WTA's Top 10 players withdraw or retire from matches at their Australian Open tune-ups. World No. 3 Garbine Muguruza kept the streak going on Wednesday, retiring with a left foot injury down 7–6, 1–0 to Varvara Lepchenko in Brisbane. It was later confirmed that the injury is related to ongoing issues with plantar fasciitis in her foot.

Looking ahead to the upcoming tennis season as 2016 kicks off

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Shenzhen Open: ​Eugenie Bouchard d. Nicole Gibbs 6–4, 6–2; ​Anett Kontaveit d. Saisai Zheng 6–1, 6–2; Agnieszka Radwanska d. Shuai Zhang 6–1, 7–5; Katerina Siniakova d. Zarina Diyas 6–0, 6–4