Williams will take on Bulgaria's Tsvetana Pironkova, who overcame Alize Cornet of France 6-4, 6-7 (5), 6-3 in another round of 16 match.
"Two per month would have been enough," Loew underlined.
The news comes after the International Table Tennis Federation (ITTF) revealed the players list.
Osaka will now face another American, Jennifer Brady, in the semifinals. One of the in-form players of the summer, Brady, who won her first career WTA singles title in Lexington last month, dispatched Yulia Putintseva of Kazakhstan to reach her first-ever Grand Slam semifinal.
"We are waiting for the health ministry to give us an answer, because having the players quarantined for 14 days, when they return from Mexico, is not possible for the clubs," FEDEFUT president Rodolfo Villalobos was quoted as saying by newspaper El Universal.
In just the third minute of the first half, 17-year-old Fati drew a foul from Serhiy Kyrvstov to earn a penalty that Sergio Ramos converted clinically.
Meanwhile, Kenya's world marathon record-holder Brigid Kosgei's track debut ended in disappointment after losing the battle to The Dutch world 1,500m and 10,000m champion Sifan Hassan who went to break the World Hour record after she reached 18,930 meters as the hour elapsed, beating the existing mark of 18,517 meters set by Ethiopia's Dire Tune in 2008.
The Austrian will now challenge 2014 champion Marin Cilic of Croatia in the third round. Thiem has a 2-0 lead in their head-to-head series.
MEXICO CITY, Sept. 6 (Xinhua) -- Jose Cruz has been named manager of Necaxa for the rest of the Liga MX Apertura season, the club said on Sunday.
Patrick Bezerra equalized eight minutes later with a header following Thiago Galhardo's cross.
"I'm kind of scared how good she's going to be in the future," Osaka said. "My biggest takeaway from her game is that she didn't back down from me or from the speed of my ball, which for someone that young is kind of amazing."