What an exciting day of tennis action here on Monday at the US Open! 🎾 Who was your #EmiratesAce of the day; @johnnyhm, @madisonkeys or @djokernole? Comment below with the #EmiratesAce hashtag for your chance to win tickets to an upcoming match. You'll also automatically be entered to win a trip to Dubai! T&Cs apply. _ #USOpen #USOpen50 #madisonkeys #novakdjokovic #johnmillman #ace #tennis #hotshot