Although Williams turns 36 in September, and achieved a long-time goal when she won an Open era-record 23rd grand slam title in Australia, she has every intention of coming back, according to Mouratoglou. It wasn't good, because I couldn't have all the staff I wanted with me. If I want something from one of my sisters I say baby Venus, baby Lyn or baby Isha needs it'.
"Probably I didn't play as well as I did the other day, but I still played well".
As if by stealth, Dominic Thiem moved into the quarterfinals with another quietly devastating performance.
Bacsinszky's skill blasting her flatter backhand on the move helped her carve out the first break in the third game. The pair could meet in the semis.
Defending champions Novak Djokovic and Garbine Muguruza were also in action later.
Venus Williams wasn't in the most talkative of moods Sunday after a three-set loss at the French Open.
The 2002 finalist has never won the event at Roland Garros and she saw another opportunity slip by on her 20th appearance in Paris.
"I'm really pleased with how we played today and excited to be in the position we are now", Venus said.
World number 290 and qualifier Petra Martic reached the last 16 with a 6-1, 6-1 win over Latvian 17th seed Anastasija Sevastova.
"I'll just keep it simple", Williams said. "I still can't believe that I'm sitting here".
Next up against Nadal is 20th-seeded Pablo Carreno Busta, who knocked off No. 5 Milos Raonic 4-6, 7-6 (2), 6-7 (6), 6-4, 8-6.
The 30th seed beat the 10th seed 5-7 6-2 6-1 in a topsy-turvy encounter on Philippe-Chatrier.
The pregnant tennis icon, 35, brought her baby bump to cheer on older sister, Venus Williams, at Roland Garros during the French Open on Friday. The tennis star not only revealed her pregnancy, but how far along she was.
Former World No. 1 Caroline Wozniacki of Denmark returned to the French Open quarters for the first time since 2010 after she eliminated 2009 champion Svetlana Kuznetsova of Russian Federation 6-1, 4-6, 6-2. "There was a few points that she played well at the end of the match, and kind of that was it".
"I'm sure she feels the excitement of being at a major and not having the pressure to play and prepare".
A drop shot brought Bacsinszky to triple match point.
"The first set I had a big lead but I started making catastrophic errors", Bacsinszky said. "She's going to call me 'favorite aunt", she said.