The female tennis stars are surely keeping the fans captivated at the year-ending World Tour Finals in Singapore. But those not featuring at the tournament have chosen to interact with their fans via social media.

Let’s take a glimpse of some of the coolest posts from the tennis stars this week on Instagram.

Caroline Wozniacki seemed nostalgia-struck as she shared a “throwback” from her poolside photo-shoot.

Casual day by the pool ????????☀️???????? #tbt

A photo posted by Caroline Wozniacki (@carowozniacki) on Oct 30, 2015 at 8:07am PDT

Wozniacki’s BFF, Serena Williams, also had a similar notion. The American prodigy rolled back the years as she posted a childhood picture of hers along with elder sister Venus, with an emotional caption.

I’m not doing so well without @venuswilliams I’m getting mentally sick. I’m lonely, I’m sad. I just really miss my best friend. My twin. My heart. My sister. I know you are working but I’m not the same without you. ???? can u come back please? ???????? I promise I will stay out of your room ???? (maybe) although I was just there getting some things I needed ???? #littlesister #sisters

A photo posted by Serena Williams (@serenawilliams) on Oct 29, 2015 at 9:19pm PDT

Meanwhile, Victoria Azarenka not only wished her fans happy weekend with a beautiful weekend, but also posted a dancing pose.

Strike a pose trio ???????? killed it tonight #dancing

A photo posted by Victoria Azarenka (@vichka35) on Oct 29, 2015 at 8:18pm PDT

Good morning #NYC ???? it’s Friday ???? the weekend ????

A photo posted by Victoria Azarenka (@vichka35) on Oct 30, 2015 at 6:12am PDT