Tweets of the Week: Does Grigor Dimitrov know how to use hashtags?

Grigor Dimitrov might not actually know how to use hashtags, Caroline Wozniacki and Rory McIlroy do some social-media flirting, Novak Djokovic tweets some BIG news and Serena Williams reveals her biggest enemy. Here are the best tweets of the week.

"@BBCScotland: .@andy_murray doesn't follow @judmoo on twitter because it's "not cool" . And I don't want him cramping my style either. :)
— judy murray (@JudyMurray) April 23, 2014

Making the most out of the day @hardwork @lovetosweat @allornothing! pic.twitter.com/Wh8IJN7uX4
— Grigor Dimitrov (@GrigorDimitrov) April 24, 2014

Jelena is pregnant!!!We will be parents soon! #blessed Postacemo roditelji uskoro!!! #najsrecniji @JelenaRisticNDF pic.twitter.com/8WG1hocGIk
— Novak Djokovic (@DjokerNole) April 24, 2014

I've only gone and scratched my nose after cutting chilli. #rookie #thisgirlisonfire
— Laura Robson (@laurarobson5) April 21, 2014

@DjokerNole @Dr_Rhodium @JelenaRisticNDF I hope they get the buildings behind you finished soon.
— Not Roger Federer (Parody) (@PseudoFed) April 23, 2014

This is who I travel with! @KonticKontara25 #zlatko Good company... Not!!! Thank God for books 😊👌 pic.twitter.com/1WDy10DCrG
— Ana Ivanovic (@anaivanovic) April 21, 2014

So I've officially ruined my friend's wedding pics. Sorry annakdukes @amerdelic http://t.co/gjeLYEVf1s
— Brooklyn Decker (@BrooklynDecker) April 23, 2014

One for the family album. @andy_murray + his Freedom of Stirling certificate r photobombed by the Wallace Monument. pic.twitter.com/rRD2PqnQC5
— judy murray (@JudyMurray) April 23, 2014

Jet lag is my biggest enemy
— Serena Williams (@serenawilliams) April 22, 2014

What a match! If Safarova doesn't shed a few tears, I will for her. Highly entertaining tennis from both players.
— Anne Keothavong (@annekeothavong) April 22, 2014

2 wins in a row on "the red stuff" - starting to understand how rafa feels april-may. #whosgotabiggerforehand
— Jamie Murray (@jamie_murray) April 24, 2014

Almost as interesting as Time's 100 most influential are the people chosen to write about Time's 100 most influential http://t.co/cihfi22aRy
— Joe Fleming (@ByJoeFleming) April 24, 2014