Sharapova knocked out of Roland Garros

She's dominated the French Open in recent years, but Russian star Maria Sharapova will not be hoisting a trophy at the end of this week. The second-seeded defending champion was ousted in the fourth round on Monday morning.

Sharapova fell 7-6, 6-4, to 13th-seeded Lucia Safarova of the Czech Republic.

She looked rankled, coughing throughout the match and never really hitting her stride. An comeback attempt fell short in the second set, as Safarova held serve.

This is her earliest defeat at Roland Garros since 2010, where she has played in the finals each of the last three years. She captured the title in 2012 and 2014. She was runner-up in 2013.

"My opponent had a different gear than I did," she said in her post-match press conference. "I felt like I had small openings, and I just wasn't able to ... play a good few points."

This is the first time Safarova has defeated Sharapova since 2010, in five attempts.

Safarova advances to her first French Open quarterfinal. In singles, has only once advanced to a Grand Slam semifinal, at last year's Wimbledon. (In doubles, she won the Australian Open this year.) She'll face No. 21 Garbine Muguruza of Spain, who defeated Italy's Flavia Pennetta, 6-3, 6-4.

Sharapova, meanwhile, is already looking ahead to the next Grand Slam.

"My opponent was at a much higher level, more consistent than I was, and that resulted in a bad day at the office," she said. "But by the time Wimbledon comes around I know that I will be ready.

Elsewhere on Monday, Roger Federer advanced with a 6-3, 4-6, 6-4, 6-1 win over hometown favorite Gael Monfils. The match started on Sunday night but was suspended after the second set due to darkness.

Monfils led 40-love in the first game on Monday, but Federer battled back to break serve. From there, it was lights out. Federer will face Stan Wawrinka in the quarterfinals.

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Danielle Elliot is a writer for Yahoo Sports. Contact her at delliot@yahoo-inc.com or find her on Twitter and Facebook.