Going into any Grand Slam, there will always be questions surrounding the players and their prospects, their level of play heading in and what it will take for them to be crowned a major champion at the end.

Here’s three questions about some of the contenders looking to add to their Grand Slam haul at the French Open.

What happened to Garbine Muguruza after winning last year’s French Open, and is it too soon to write her off?

Being comfortable in the role of a Grand Slam contender isn’t easy for everyone. Muguruza shocked the world with her upset of Serena Williams to win her first major title at Roland Garros last year.

The year before, Muguruza reached the final of Wimbledon; the two final appearances in four Slams offered a promising sign for her future.

After that French Open win, though, the wheels seemed to fall off: Muguruza’s only made three semifinals since that surprising victory. Her game hasn’t changed, but the expectations have.

She is only 23, which means there’s plenty of time for a turnaround. Her run in Rome was encouraging and should give her some confidence as she prepares to defend the biggest title of her young career, even though she had to retire in her semifinal due to injury against Elina Svitolina. She still has the tools that allow her to excel on all surfaces. If she wins another Slam, perhaps in Paris, or makes a Slam final, all the struggles of the past year will be forgotten.

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French Open questions: Muguruza, Stan and a calendar-year doubles Slam

French Open questions: Muguruza, Stan and a calendar-year doubles Slam

With Roger Federer missing the French this year, and questions surrounding Novak Djokovic and Andy Murray, is Stan Wawrinka the biggest threat to Rafael Nadal at Roland Garros?

He should be. With his bludgeoning ground strokes and fearlessness under the spotlight, Wawrinka possesses the tools to add another French Open trophy to the one he captured in 2015.

His 2017 campaign, though, has been subpar. The start of the year was promising, with a semifinal appearance at the Australian Open and a runner-up finish in Indian Wells. On both occasions, he lost to his countryman, Federer, in matches where he had his opportunities. Since Indian Wells, he hasn't made a quarterfinal.

However, Wawrinka wasn’t supposed to win the Australian Open in 2014. Nor was he expected to win the French in ’15. That U.S. Open title last year was supposed to go to Djokovic. Wawrinka has a knack for coming up with the goods when he’s overlooked. This year’s French Open presents a perfect opportunity to get back in the winner’s circle.

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The bid for a calendar-year Grand Slam in men's and women's doubles is still in play. (It's not in men's singles and women's singles.) Can the Bethanie Mattek-Sands/Lucie Safarova and Henri Kontinen/John Peers pairings keep the dream alive?

The last team to win all four majors in a year was the Hall of Fame duo of Martina Navratilova and Pam Shriver, back in 1984. Martina Hingis accomplished the calendar-year women's doubles Grand Slam with two different partners back in 1998.

It's a task rife with pressure: Just ask Bob and Mike Bryan, arguably the greatest doubles team of all time, who fell short in their quest in the 2013 U.S. Open semifinals.

Mattek-Sands and Safarova, aka “Team Bucie,” have actually been in this position before, winning the Australian Open in 2015 and following it up with a French Open title. With their Grand Slam-winning credentials—they’re actually going for their third major in a row, having won the U.S. Open last year)—they’re going to be the favorite in every tournament they enter. The clay-court season’s been a little tricky for the duo: They won on green clay at the Volvo Car Open in the U.S., but came up empty on the European swing. They do raise their games for the Premier events and have a strong chance of winning another Grand Slam.

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As for Kontinen and Peers, their fate at the French appears to be a bit precarious. After last year’s U.S. Open, the Australian-Finnish team was nearly unbeatable, especially on big occasions. They won the ATP World Tour Finals at the end of the year, and that form carried over into 2017 as they captured the Australian Open, the first men’s doubles Slam for both.

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The clay courts, though, have not been kind to the pair. They haven’t won a title on the dirt, nor have they even reached a final. They’re still sitting quite comfortably on top of the team rankings, but they might have to be content with that over the final leg of the clay-court stretch. They should be the favorites for Wimbledon, but as far as the French goes, the calendar Grand Slam dream might be coming to a halt.

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