Not long after checking in with fans and friends on Tennis Channel, Victoria Azarenka announced the birth of her first child late on Monday night.

The former No.1 began the season winning three titles in Brisbane and the elusive Sunshine Double in Indian Wells and Miami, but left the tour back in July after announcing her pregnancy. Azarenka took to social media to share her first picture as a mother on Twitter:

Today I had my hardest fight and my very best victory! Our son was born healthy and happy! So thankful and blessed! Thank you ??❤ pic.twitter.com/zsoFRivnvQ

— victoria azarenka (@vika7) December 20, 2016

Her colleagues and fellow players extended their hearty congratulations to the two-time Australian Open champion on Twitter, as well:

@vika7 Congratulations on your new little family Vika! ?

— Laura Robson (@laurarobson5) December 20, 2016

@vika7 ahhhh! So glad everybody's good!!! Congrats !!????????

— Irina Falconi (@IrinaFalconi) December 20, 2016

@vika7 congratulations, amazing News? wish you all the best xx

— Belinda Bencic (@BelindaBencic) December 20, 2016

@vika7 поздравляю вас!! ❤?

— Daria Gavrilova (@Daria_gav) December 20, 2016

@vika7 congrats Vika!!

— rennae stubbs (@rennaestubbs) December 20, 2016