They include Justin Trudeau, the Canadian Prime Minister who said that the 19-year old had done the 'whole country very proud' and he also led the #SheTheNorth hashtag which has gone viral as a result.
Some of the best Canadian teams from all sports also posted messages of support; including the Vancouver Canucks and Toronto Raptors who have both made jerseys with Andreescu's name on the back for her.
https://twitter.com/JustinTrudeau/status/1170463888007225344
https://twitter.com/Canucks/status/1170457053233471488
https://twitter.com/Raptors/status/1170456737972985856
As well as that, the likes of Chrissy Teigen and some top names of tennis including Canada's own Vasek Pospisil, Simona Halep and Billie Jean King in what has been a brilliant outpouring for the new Grand Slam champion.
https://twitter.com/chrissyteigen/status/1170466144311865345
https://twitter.com/VasekPospisil/status/1170456911675822080
https://twitter.com/Simona_Halep/status/1170467816597786626
https://twitter.com/BillieJeanKing/status/1170459246695264256