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France Tennis French Open

Madison Keys celebrates as she defeats Romania's Mihaela Buzarnescu during their fourth round match of the French Open at Roland Garros Sunday in Paris. Keys won 6-1, 6-4.

PARIS — Madison Keys was keeping an eye on a TV while getting treatment at Roland Garros the other day, watching her pal Sloane Stephens pull out a tight three-set victory.

"Living and dying on every point in the end," Keys said. "I saw her in the locker room, and I was like, 'God, you made me nervous at the end.' She was like, 'You were nervous?'"

The two young Americans are friends who have known each other for about a decade. They're Fed Cup and Olympic teammates. They even debuted in a Grand Slam final together, when Stephens beat the Rock Island native for last year's U.S. Open title. And now they're both French Open quarterfinalists, each making it that far in Paris for the first time with relatively easy straight-set victories at Court Philippe Chatrier on Sunday.

The 10th-seeded Stephens was a 6-2, 6-0 winner against No. 25 Anett Kontaveit of Estonia in 52 minutes, while No. 13 Keys beat No. 31 Mihaela Buzarnescu of Romania 6-1, 6-4 in 65 minutes.

If Stephens, 23, and Keys, 25, each picks up one more victory, they will face off for a berth in the championship match.

"I always want to see Sloane do well," Keys said. "I'd love for both of us to be able to be in the position to play each other multiple times. ... I'm always cheering for her."

Stephens monitors her pal's progress, too.

"I mean, she's, like, really the only person I actually watch, because I will be texting her during the match: 'Come on! What are you doing?'" Stephens joked. "She's been playing well. Obviously in a Slam, she really gets up, so she's going to make whoever she plays, play. And I think that's what's great about Maddie."

Both Keys and Stephens have now managed to complete a set of quarterfinal runs at all four Grand Slam sites.

Next up for Keys, a powerful hitter who hasn't always loved playing on red clay, is a match against 98th-ranked Yulia Putintseva of Kazakhstan. Putintseva eliminated No. 26 Barbora Strycova of the Czech Republic 6-4, 6-3 on Sunday.

Stephens' quarterfinal opponent will be No. 2 Caroline Wozniacki, the reigning Australian Open champion, or No. 14 Daria Kasatkina of Russia. The fourth-round match between Wozniacki and Kasatkina was suspended because of darkness Sunday night in the second set. Kasatkina took the opening set 7-6 (5), and they were tied at 3-all in the second when play was halted until Monday.

On the men's side, Marco Cecchinato of Italy defeated Belgium's David Goffin in four sets and Novak Djokovic beat Fernando Verdasco in three sets.

Also, Austria's Dominic Thiem defeated Japan's Kei Nishikori in four sets and Alexander Zverev of Germany beat Russia's Karen Khachanov in five sets.

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