An absent-minded decision means the Scottish tennis star is "in the bad books at home."
Andy Murray, Naomi Osaka, Novak Djokovic and Madison Keys all nailed "The Tonight Show" challenge.
The British tennis star said the Australian Open could be his last tournament.
U.S. Open mixed doubles champ Jamie Murray said other players just "get on with it."
"This tweet is perfection."
The tennis star wrote an essay for BBC on the importance of women's equality.