She stood, solemn, but shoulder to shoulder in Arthur Ashe Stadium with the only person to offer her solace - losing finalist Serena Williams, who had earlier screamed "you owe me an apology" at umpire Carlos Ramos for pulling her up for receiving coaching from the stands.
The interview is a bit of a shock given the very clear rules set forward by the International Tennis Federation which prohibit judges from commenting in any way on the matches they oversee as well as from socializing with players.
He received praise from the ITF for his professionalism in one of the most controversial Grand Slam finals of all time.
Williams' rage appeared to be fuelled in part because she perceived this code violation as rarely enforced (and certainly not in grand slam finals). When asked what she'll buy with her $3.8 million in prize money from the US Open, she selflessly says she'll get something for her parents.
The Women's Tennis Association also backed Williams, with their CEO Steve Simon saying, "The WTA believes that there should be no difference in the standards of tolerance provided to the emotions expressed by men versus women". Mouratoglou openly acknowledged he was coaching but used the "everyone is doing it" argument as justification. Ramos need not have stuck so closely to the rule book as he did because his primary duty is to help players across choppy waters.
The ITF's belated support reflected the growing consensus that Ramos handled the situation impressively in what were very hard circumstances.
"At the end of the day, I hope everybody understands and celebrates Naomi because she's the U.S. Open champion and that's pretty dope".
Naomi Osaka - a self-confessed Serena fan - went on to win her maiden grand slam amid unsavoury scenes where she was jeered during the presentation ceremony and felt the need to apologise to the unhappy fans on Arthur Ashe court.
Swedish umpire Mohamed Lahyani was reprimanded by the USTA for going "beyond protocol" when he climbed down from his chair to give Nick Kyrgios a pep talk during his second-round match against Pierre-Hugues Herbert.
Several commentators, including tennis great Chris Evert, have pointed out that Ramos missed the opportunity to defuse the situation by first issuing a "soft warning", along the lines of asking Williams to calm down or warning her that she was risking another code violation.
The verbal abuse violation came after Williams took shots at him, calling him a "liar" and a "thief".
Widmaier said the feeling at USTA is that there needs to be a push to ensure consistency in the application of the rules, including coaching violations and shirt changes by women players.
"What happened on court in this particular match is not something that is going to trouble professional umpires".