However, on Sunday she took part in a third-round doubles match with sister Venus, losing 6-4 6-7 (4) 6-0 to Andreja Klepac and Maria Jose Martinez Sanchez, and apparently aggravated an injury she had first felt the previous day.
She is now in doubt for Wimbledon after suffering pectoral soreness.
In just 59 minutes, the two-time French Open finalist easily overcame 16th-seed Mertens in their second career match, winning 63 percent of her first serves and 78 percent of her second, reported Efe.
Williams was frustrated by the injury.
The Russian will face either 2016 champion Garbine Muguruza or Lesia Tsurenko of Ukraine for a semifinal place. "I won't know [about Wimbledon] until I get those results", she said.
"But I believe I can hold a trophy not only here, I believe I can do it in every tournament I play. I didn't expect to be reading a book about me, that wasn't necessarily true".
"I'm having an MRI (scan) tomorrow, I'm going to stay here to see the doctors and see as many specialists as I can".
"There is a lot of theories".
"I've never had this before. I just started. So I'm just really trying to get my bearings and trying to feel out where I am and see where I can go", Serena stated. Like, this is so painful.
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Romanian Halep, twice a runner-up at Roland Garros, started slowly but once she found her groove, there was nothing the 16th seed could do to avoid a one-sided defeat. Sadly, when you do have an injury that you have had before, you can kind of manage it. I can only take solace in the fact I'm going to continue to get better.
The victor of 23 majors was due to face Maria Sharapova in a sellout Roland Garros clash, but the appointment was wiped just minutes before the players were due to walk on court.
"I was looking forward to my match against Serena today and am disappointed that she had to withdraw", the 28th seed said.
The 36-year-old Serena Williams faced No. 11 seeded German Goerges.
"I gave up so much time with my daughter and time with my family all for this moment". I put everything on the court.
"It's very hard because I love playing Maria", the 23-time major champion added.
"Every match has been getting better for me". So it's extremely disappointing.
"I tried a lot of different tapings and support and it didn't really get a lot better", the American added.
