(CNN)In a stunning result, US Open defending champion Naomi Osaka mislaid her third-round lucifer to Canada's Leylah Fernandez successful 3 sets, arsenic the satellite No. 3 and four-time large champion uncharacteristically showed signs of vexation connected the tribunal and expressed doubts aft the match.
"I honestly don't cognize erstwhile I'm going to play my adjacent tennis match," Osaka said done tears successful a property conference. "I deliberation I'm going to instrumentality a interruption from playing for a while."
Osaka, who was starring by a set, broke Fernandez for a 6-5 pb successful the 2nd set. But erstwhile serving for the match, Osaka couldn't adjacent it out. During the tiebreak, Osaka slammed her racquet to the court.
Fernandez, 18, would triumph the tiebreak to unit a last set, and past the satellite No. 73 broke Osaka to unfastened the third. Not agelong aft that, Osaka deed a shot into the assemblage and was deed with a codification usurpation for shot abuse.
Fernandez went connected to triumph the lucifer 5-7, 7-6(2), 6-4.
The Canadian, who turns 19 connected Monday, volition adjacent look No. 16 effect and three-time large champion Angelique Kerber of Germany.
Fernandez -- who played a superb lucifer -- gave recognition to the assemblage successful her on-court interview, arsenic the Canadian had tremendous enactment from those successful attendance.
"It felt truthful energetic," the Canadian teen told ESPN. "The fans were amazing. They were truthful loud. They helped maine truthful overmuch passim the 2nd acceptable and past the third. I'm conscionable truthful blessed to beryllium connected the large signifier finally."
In her on-court interrogation aft the win, she said she knew "from the precise beginning" that she could bushed the defending US Open champion.
"Right earlier the lucifer I knew I was capable to win," she said.
Osaka expressed regret aft the lucifer regarding her emotions shown connected the court.
"Yeah, I'm truly atrocious astir that. I'm not truly definite why. Like, I felt similar I was beauteous -- I was telling myself to beryllium calm, but I consciousness similar possibly determination was a boiling point," she said.
"I consciousness similar for maine recently, like, erstwhile I triumph I don't consciousness happy," she said. "I consciousness much similar a relief. And past erstwhile I lose, I consciousness precise sad. I don't deliberation that's normal."
In May, Osaka withdrew from the French Open aft being fined $15,000 for refusing to talk to the media astatine Roland Garros, and chose to not enactment successful this year's Wimbledon Championships.
Fernandez was asked astir Osaka losing her composure during the match.
"Honestly I wasn't focusing connected Naomi," Fernandez said. "I was lone focusing connected myself and what I needed to do."
As for turning the lucifer astir erstwhile she broke backmost against Osaka to level the 2nd acceptable astatine 6-6, Fernandez said, "I conjecture I wanted to enactment connected tribunal a small spot longer, and I wanted to enactment connected a amusement for everybody here. One hr was conscionable not capable for maine connected court."
CNN's Jacob Lev and Ben Church contributed to this report.
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