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The two posted a cute video from a new joint Instagram account. 

Elina Svitolina, like Alexander Zverev, will look to build on her year-end success.

These 20 players finished 2018 on a hot streak, and will strive to sustain it.

Which young faces will make the biggest impact on the new season? 

Koalas, lions and pigs all made the list. 

Some of their answers might surprise you. 

Tennis stars were looking cover magazine perfect this week. 

The world No. 4 gives the full scoop on some of her best Instagram posts. 

The Dutch player became engaged with her longtime-boyfriend Remko de Rijke.

Some had a few different costumes to share, while others threw it back to fun times.

The Ukrainian earned the biggest title of her career by winning the WTA Finals.

A look at each of their biggest matches, including the Singapore final. 

There's a lot more to the 2017 US Open champion than meets the eye.

A large chunk, $30,000 to be exact, will be donated to charity.