PARIS, France – It was another rainy day in Paris on Day 6 at Roland Garros, but the Round of 16 is set. On Saturday, the favorites continued to deliver.

Four Americans into the Round of 16: Serena Williams, Venus Williams, and Madison Keys joined Shelby Rogers into the the fourth round on Saturday. Serena fought off Kristina Mladenovic, winning 6-4, 7-6(10) in two hours and 11 minutes in a rain-interrupted match. Venus moved her record against Alizé Cornet to 6-0 with a 7-6(5), 1-6, 6-0 win to move into the second week for the first time since 2010. Keys held off Monica Puig to win 7-6(3), 6-3 to make her first Round of 16 in Paris.

“It was always a goal mine to make second week, and then once I made second week the first time it became achievable, and then it became something that I wanted to do all of the time just to have the consistency,” said Keys. “Where I may not have had the consistency outside of Slams, I had it in the Slams.

“I just think it’s something that I’m getting more and more comfortable with. Obviously I’ve been playing well in the Slams for the past six, seven Slams that I’ve played in. I don’t think it’ll always be, Oh, I’m so happy, but right now I’m just really happy with how I’ve been doing and hope to keep it up.”

Carla Suárez  Navarro scores a big win: No.22 seed Dominika Cibulkova looked to be building a full head of steam as the tournament turned towards the second week but No.12 seed Suárez Navarro found a way to end her resurgent run on clay, winning, 6-4, 3-6, 6-1 to make the fourth round for the third time in the last four years. The Spaniard appeared to injure her leg in the first set but was able to shake it off to battle for the win.

“During the first set I ran from the right side to the left side of the court, and I had the impression that I had some problems with my muscle,” she said. “But it was not a pulled muscle. And the pain vanished.”

Yulia Putintseva steamrolls through to her Round of 16 debut: Through three matches, Putintseva has lost just 10 games, posting scores of 6-1, 6-1, 6-2, 6-2, 6-1, 6-1 with wins over Aleksandra Wozniacki, Andrea Petkovic, and Karin Knapp. The draw didn’t offer much early resistance, especially given Petkovic’s recent slump, but Putintseva has looked ruthless. She’ll play Suárez Navarro for a spot in her first Slam quarterfinal.

Kiki Bertens wins 10 straight matches: Bertens has put in some hard yards over the last few weeks and it paid off in her marathon 6-2, 3-6, 10-8 win over No.29 seed Daria Kasatkina. The young Russian picked up a left leg injury late in the third set and could only arm in her serves, and Bertens steeled her nerves to score her 10th straight win, after winning the title last week in Nürnberg. She is into the fourth round for the second time in Paris and will play Keys.

Kristina Mladenovic credits the Serena serve: The Frenchwoman fought hard to stay in it against Serena, fighting off nine break points in the second set to get it to a tie-break. Then the rain came, and after a lengthy rain-delay at 6-6 she was faced with the prospect of coming out of the locker room to win a tiebreaker to stay in the match. She led 5-2 upon resumption but couldn’t hold off her nerves or Serena. A key forehand miss that would have given her 6-2 went wide, and Serena stormed back, finally converting her fifth match point.

“I think it was a good match, a beautiful match, as well,” Mladenovic said afterwards in French. “On both sides, I think. Sometimes there are days that she’s not really into the match or she has difficulties due to what she does, but today I think it was really difficult for both of us. I think I put out good tennis, solid, from the first to the last ball. And during the rallies I thought that ‘she was beatable.’

“But then, as I said, I told you, she’s exceptional, and her biggest strength is her serves. She hit me so much with those serves. But then I’m a bit frustrated. She’s such a great champion, and she manages to escape and find a way out with this weapon.

“Sometimes her statistical results with her serve are not as good as today, and this is what I felt today. There’s not much difference in the match. There’s just one break point. First set when we were 5-4, and then I seized this opportunity on the break point when it was 4-All, and then I took a risk and to be aggressive on my forehand where she serves really long balls in the second balls.

“But today she was so impressive with her serve. There were many games when it was 30-All, and each time it was a big first serve. And yet I think I returned quite well. This is incredible. There’s no moment when she went down. No, so on both sides it was a good fight, a beautiful fight.”

Round of 16 Set: Week 1 is in the books. Here’s how Week 2 tees up: Serena vs. Svitolina, Suárez Navarro vs. Putintseva, Bertens vs. Keys, Venus vs. Bacsinszky, Begu vs. Rogers, Kuznetsova vs. Muguruza, Halep vs. Stosur, Pironkova vs. Radwanska.

Kuznetsova tries to stop Muguruza on Sunday: The forecast doesn’t look great for Sunday, but the match of the day is undoubtedly Kuznetsova vs. Muguruza. The two have played only once, last year in Madrid, which Kuznetsova won 6-3, 5-7, 7-5 en route to the final.

The key for Kuznetsova: relax. The 2009 champion said she’s struggled to keep things in perspective this week. “I was better today because first matches I was extremely tense,” Kuznetsova said after beating Anastasia Pavlyuchenkova. “Today I said to myself, Look, you got to get out of this tense. I got to just play my game, and whatever happens, my goal for this year was trying to enjoy the tennis.

“Since I got a bit better ranking and everything I start to be tense again, and I don’t want it to happen. I had a great nap in the locker room while the guys were playing five sets. I was great. I was feeling much better.

“So I said, Okay, I just go out there and I want to be happy. That’s the only thing I was concerned about.”

Since being taken to three sets in the first round by Anna Karolina Schmiedlova, Muguruza has been on a tear. Her last four sets: 6-2, 6-0, 6-3, 6-0. A win over Kuznetsova you would expect her to make her first semifinal in Paris.

Photos courtesy of Getty Images.