Serena, who first met the 33-year-old entrepreneur in 2015, revealed her family plans last year, telling America's Glamour magazine, "I definitely want to have kids one day". "I'm happy to confirm that Serena is expecting a baby this fall", Novak said in a statement.
Serena hasn't appeared on court since defeating her sister Venus in the Australian Open final in January, as she has pulled out of a number of tournaments this year.
Williams, who is engaged to the co-founder of community news and chat site Reddit, Alexis Ohanian, is on top of the all-time list of major winners since Grand Slams accepted professional players in 1968.
Her victory over older sister Venus Williams broke a tie with Steffi Graf for the most Grand Slam singles championships in the sport's modern era.
Serena Williams revealed she was 20 weeks pregnant with a baby bump pic on April 19 and literally blew everyone's minds!
Kenyans Edna Kiplagat, Geoffrey Kirui Win Boston Marathon Titles
In the women's race, Kiplagat conjured a similarly decisive burst over the closing stages to claim the race for the first time. For everyone who runs, just being part of the history and pedigree of the Boston Marathon is a dream come true.
Williams has remained active in her pregnancy; for one, if she is about five months along, that means she was pregnant when she won the Australian Open.
A congratulatory tweet from the Women's Tennis Association was also deleted.
Serena Williams shocked literally everyone when she debuted her adorable baby bump!
After deleting the Snapchat post, there was speculation as to whether Williams was just playing with fans - even as good wishes flowed in from fellow celebrities and US Open Tennis. Both women should find some inspiration from three players who returned from maternity leave to lift Grand Slam trophies again.
In 2016, Williams shared another photo in which she's clad in a vibrant daffodil hue, that time while riding a horse on a tropical vacation she took after losing in the U.S. Open semifinals.
Oil producers 'might have to' extend output cuts: Saudi minister
One African country has expressed interest in joining, Marzouq said, without identifying it. OPEC agreed to slash the output by 1.2 million barrels per day from January 1.
Williams posted a picture of the two on a beach on Monday.
The tennis superstar posts selfie on Snapchat, then deletes it. Congratulations have started to pour in. Another former No. 1 and major champion, Victoria Azarenka, has announced she'll be getting back on tour after having a baby previous year.
The baby news means she will miss this year's Wimbledon, having previously won the tournament seven times.
"That fetus has won a Grand Slam title and I'm living a regular shmegular life".
Monaco offer Dortmund plaque as show of solidarity
While Real Madrid and Atletico Madrid had already booked a place in the last four earlier, Juventus and Monaco joined them on Wednesday.