The Serbian player, who won the first three Grand Slams of the year, was defeated by Germany's Alexander Zverev in three sets.
"For anyone saying I quit, I didn't quit," Biles wrote on Instagram. "My mind and body are simply not in sync."
The champion gymnast posted on Instagram stories on Friday morning to answer followers' questions and offer more details about her withdrawal from the Tokyo 2020 Olympics.
Day 7 of Tokyo 2020 has seen several Olympic records broken and Team USA remains in the top five in the medal table.
The black cat's presence ultimately ended up being bad luck for the U.S. men's team though.
"I have always been for clean conditions (in the sport)," Rylov said in response.
The Americans take on the No. 3-ranked team in the world on Friday in a bid to keep their dream of a first Olympic gold in nine years alive.
"Being the best also means knowing how to take care of yourself. We are inspired by her leadership today and are behind her every step of the way," Athleta said.
"I mean, you name it, we got it," one Olympian reflected. "We got decked out."
After two relay golds in Rio five years ago, the swimmer from Florida won his first individual Olympic gold in the 100m freestyle on Thursday.
The track and field program at Tokyo 2020 begins on Friday with the men's 10,000m gold medal up for grabs.
Dominique Moceanu was 14 and carrying an injury when competing at the Atlanta Olympics.
The top 60 players in the world compete in the men's and women's tournaments as Team USA chases a first gold since 1900.
His admission came during a week in which the mental toll of Olympic competition has been put into sharp focus.
Several athletes have already been forced to pull out of the games due to a positive result, as Tokyo reported record new daily coronavirus cases on Wednesday.
Biles said she has real-world issues beyond her athletic prowess, which is packed like dynamite inside her 4-foot-8 frame.
"I love you, too," Dressel said, as his eyes cried more water than he'd just swam through at the Tokyo Aquatic Center.
"Awesome Dawesome" opens up about Biles pulling out of the Olympics and her own efforts to change the culture of gymnastics.
"Contrast this with our selfish, childish national embarrassment, Simone Biles," tweeted Aaron Reitz in response to a post about 1996 Olympian Kerri Strug.
Caeleb Dressel is representing Team USA at the Tokyo Olympics. We take a look at the swimmer's career, personal life and the meaning of his tattoos.
"A day in my life in the Olympic village!" the Nigerian-American basketball player says at the beginning of her video, viewed more than 5 million times.
"No one is born with those abilities. Those abilities come with time," said the tennis star.
The British TV host hit out at Simone Biles this week, but does not appear to appreciate criticism of his own sporting failure.
For 33 years, sprinters have been chasing records set by Flo-Jo, and some are getting closer.
Swiss sprinter Alex Wilson had his doping ban reinstated on Wednesday following an appeal by World Athletics.
Tennis player Daniil Medvedev became incensed when asked whether Russian athletes were "carrying a stigma of cheaters" in Tokyo.
"The people generally get along, appreciate each other, no matter what country you're talking about," U.S. basketball coach Gregg Popovich said.
Simone Biles, the most decorated gymnast in history, has pulled out of two gymnastics finals at the Tokyo 2020 Olympic Games.
The American swimmer drew comparisons with Usain Bolt following her impressive victory in the women's 1500m freestyle.
Carey finished ninth in qualifying but will replace Biles in the all-around final after the four-time Olympic champion withdrew.