Williams raced to a 3-0 lead over two-time major champion Garbine Muguruza in their third-round match before dropping six straight games and the first set, 6-3.
Serena Williams shared a video on her Instagram which unintentionally dropped a major Avengers: Endgame spoiler.
Williams dropped as low as 491st upon her return to competition in March 2018 but is up to No. 10 after reaching two Grand Slam finals.
Serena Williams has lost her Australian Open quarterfinal to Karolina Pliskova after being called for a foot-fault on match point.
Serena Williams defeated Simona Halep 6-1, 4-6, 6-4 in round four of the Australian Open.
Serena Williams will face Simona Halep in the fourth round after beating Dayana Yastremska 6-2, 6-1 while Garbine Muguruza eased past Timea Bacsinszky 7-6 (5), 6-2 in round three of the Australian Open.
Surely, everything felt a tad different up-close-and-personal with the 37-year-old American in Rod Laver Arena.
Halep reached the final in Australia last year after saving match points in the third round and again in the semifinals, but lost the championship match to Caroline Wozniacki.
Williams is pursuing an 8th title in Melbourne and 24th Slam trophy overall, which would equal Margaret Court — whose career spanned the amateur and professional eras — for the most in tennis history.
Taking to her Twitter handle, Williams posted her picture along with daughter Olympia and said that as working parents "anything is possible".
Federer and playing partner Belinda Bencic overcame Williams and Frances Tiafoe in the Fast4 format in front of a 14,000 capacity crowd.
WTA has also decided to guarantee players that they will not have to face a seeded player in a tournament's opening round.
While responding to Williams' meltdown, McEnroe said: "If thief is the worst word she used, I have got some bad news for you."
Umpire Ramos gave Williams a code violation after her coach gestured in her direction early in the second set of Naomi Osaka's 6-2, 6-4 victory over the American.
Carlos Ramos, the chair umpire who penalized Williams is also handling their best-of-five semifinal series against Croatia this weekend.
The Australian cartoonist behind the controversial depiction of Serena Williams jumping up and down on a broken racket has defended himself against claims of racism.
British novelist J. K. Rowling has slammed an Australian cartoonist, Mark Knight for his 'racist' depiction of Tennis ace Serena Williams at the U.S. Open.
US Open Men's champion Novak Djokovic said he thought chair umpire Ramos should not have pushed Williams so hard.
Williams had lost the final 6-2, 6-4 to Japan's Naomi Osaka but the game made the headlines for her allegation that Ramos treated her differently than he would a male player.
For the first time in the United States Open, the trophy ceremony was drowned out by whistles and boos in support of the loser and against the champion.
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