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The countdown to New Year has begun.

Many of our favorite stars are already gearing up for 2018—or winding down from 2017—all over the world.

Safin: Zverev Is The One

Here's how some players are pumping up—or partying up—as we enter holiday season.

Novak Djokovic served up practice...

 

Serve to Win 😉⚡️🎾 ! Very exited ! Idemoooo #servetowin #serve #training #motivation

A post shared by Novak Djokovic (@djokernole) on

Nov 30, 2017 at 4:39am PST

...And new coach Radek Stepanek

 

Not long ago, @radek_stepanek and I were on the opposite sides of the net. Now we are teaming up to chase new goals together and share the love for the game. What exciting times we have ahead of us! #NoleFam please welcome Radek to our family! 👏💪

A post shared by Novak Djokovic (@djokernole) on

Nov 30, 2017 at 2:17pm PST

Olympic gold-medal champion Monica Puig dons the mask for deep training.

 

Kicking off Week 4 Bane style 😈🚴🏼‍♀️

A post shared by Monica Puig (@monicaace93) on

Nov 27, 2017 at 3:06pm PST

Fernando Verdasco and Gael Monfils engaged in an entertaining practice session in Miami.

 

Preseason 🤙🏽🎾💪🏽💦

A post shared by Fernando Verdasco (@ferverdasco) on

Nov 28, 2017 at 3:39pm PST

Dominika Cibulkova strengthens her legs and lungs with a mountain run.

 

About today with @joe.ivanko #POME 👊🏻👊🏻👊🏻

A post shared by Dominika Cibulkova (@domicibulkova) on

Nov 30, 2017 at 8:49am PST

Stan the Man meeting his fans.

 

Great day with @swisseducationgroup !!📚📕🖋

A post shared by Stanislas Wawrinka (@stanwawrinka85) on

Nov 27, 2017 at 9:22am PST

Garbine Muguruza hops into training.

You thought Elina Svitolina was a baseliner, but she never misses a volley.

 

Fridayayayayay 🏋🏼‍♀️🚴🏼‍♀️🏃🏼‍♀️🔄

A post shared by Elina Svitolina🤞🏼 (@elisvitolina) on

Dec 1, 2017 at 3:45am PST

 

Friday gym feeling! 🏃🏻‍♀️🏃🏻‍♀️ #viernes✌

A post shared by Garbiñe Muguruza (@garbimuguruza) on

Nov 24, 2017 at 12:02pm PST

US Open champion Sloane Stephens makes a statement in her return to court.

 

Good Morning

A post shared by Sloane Stephens (@sloanestephens) on

Dec 1, 2017 at 8:26am PST

Janko Tipsarevic makes a splash at Necker Cup.

 

@neckercup @neckeropen @slsbahamar

A post shared by Janko Tipsarevic (@tipsarevicjanko) on

Nov 29, 2017 at 2:40pm PST

Grigor Dimitrov embraced The Shark.

 

Straight Outta the World Tour Finals! Grigor Dimitrov is back as the world number 3, giving Greg Norman some tips for the 2017 Manuka Doctor Necker Cup presented by Metal #neckercup #neckeropen #manukadr #metalpaysme #premierlive #mehowmusic #takeaimphotography

A post shared by Necker Cup (@neckercup) on

Dec 1, 2017 at 7:05am PST

Tommy Haas joins forces with Sir Richard Branson at Necker Cup.

 

New Balls Please! The 2017 Manuka Doctor Necker Cup presented by Metal is underway! #neckercup #manukadr #metalpaysme #premierlive #mehowmusic #takeaimphotography

A post shared by Necker Cup (@neckercup) on

Nov 30, 2017 at 9:15am PST

Carla Suarez Navarro hangs with her favorite player.

 

¡Enhorabuena por cerrar el año como No. 1! ¡Eres historia del deporte! ¡Vamos @rafaelnadal! 🔝1️⃣ ¡Espero que vuelvas al 100% la próxima temporada! 😘

A post shared by Carla Suárez (@carlasuareznava) on

Nov 27, 2017 at 3:30am PST

Rafa chillaxes on the beach.

 

Disfrutando de estos días con mis amigos y familia... Adivináis dónde estamos? 😉 Enjoying some days of holidays with my friends and loved ones... Can you guess where we are?

A post shared by Rafa Nadal (@rafaelnadal) on

Dec 1, 2017 at 7:53am PST