Bianca Andreescu tweeted a picture of her posing with a customised WWE belt and wrote: "Thank you WWE for the gift! Who trynna square up?"
This time last year, Bianca Andreescu was sat at home nursing an injury and coming to terms with a second successive failed attempt at making the US Open main draw.
US Open Final: Serena Williams had 33 winners but just as many unforced errors. She hit nine aces but misfired eight double faults and hit only 44 percent of her first serves.
Bianca Andreescu became Canada's first Grand Slam singles champion on Saturday with a rollercoaster win.
US Open 2019 Highlights, Serena Williams vs Bianca Andreescu: Serena Williams lost consecutive US Open final.
Serena Williams could become only the fourth mother in the Open Era to win a Grand Slam title after Aussies Margaret Court and Evonne Goolagong Cawley and Belgium's Kim Clijsters.
US Open: Serena Williams, who is seeking a 24th Grand Slam singles title to match Margaret Court's all-time record, brushed aside fifth seed Elina Svitolina 6-3, 6-1.
Serena Williams dismantled Wang Qiang 6-1, 6-0 in a complete mismatch that was the quickest at this year's US Open to set up a semi-final clash with Ukrainian trailblazer Elina Svitolina.
Serena Williams' coach, Patrick Mouratoglou, insists that all players are coached from the sidelines and it is hypocrisy to deny it exists.
Serena Williams will play for a semi-final berth on Tuesday against China's Wang Qiang, who upset French Open champion Ashleigh Barty to reach quarter-final.
Serena Williams, seeking her 24th Grand Slam title, is spending precious rest time preparing for her clothing line's presentation at Fashion Week.
Serena Williams continued her quest for a 24th career Grand Slam title to equal Margaret Court's all-time record by crushing Karolina Muchova 6-3, 6-2 in 74 minutes.
Eighth seed Serena Williams is seeking to match Margaret Court's all-time record of 24 Grand Slam crowns.
Serena Williams needed only 59 minutes to rout her Russian rival, improving to 20-2 all-time against Sharapova with her 19th consecutive victory in the rivalry.
Carlos Ramos will not officiate any US Open matches involving Serena or Venus Williams.
Serena Williams is looking to match the all-time record of 24 Grand Slam singles titles won by Margaret Court when the year's final major championship gets under way Monday.
Naomi Osaka benefitted from the second round defeat of former number one Ashleigh Barty and the failure of Karolina Pliskova to reach the semis in Toronto.
Bianca Andreescu, 19, was up 3-1 with a break of serve when 23-time Grand Slam champion Serena Williams decided she couldn't continue.