Novak Djokovic vs. Gilles Muller: Score and Reaction from 2015 French Open

Top-seeded Novak Djokovic made quick work of Gilles Muller in the second round of the 2015 French Open on Thursday with a 6-1, 6-4, 6-4 victory, but the Serbian superstar may have exited the match worse for wear.

After dominating his Luxembourgian opponent in the first set, Djoker struggled a bit in the second, as he had to call out the trainer to tend to an injury.  

According to Ben Rothenberg of the New York Times, the world's No. 1 player informed the physio he was dealing with a groin ailment:

"

Djokovic/trainer are saying that he feels pain in his groin when he lands on his right leg. Cringing quite a bit as he gets worked on. #RG15

— Ben Rothenberg (@BenRothenberg) May 28, 2015"

Djokovic was able to return to action after several minutes of treatment, and he ultimately closed out the second set despite being somewhat limited.

As Rothenberg pointed out, Djoker was aided by the fact that Muller doesn't generally engage in lengthy, back-and-forth rallies:

Despite the injury, Djokovic was too good for his overmatched opponent in the third set, taking it 6-4 to win the contest in straight sets.

With that victory, the 28-year-old star extended his impressive winning streak and improved his fantastic record on clay in 2015, according to Roland Garros on Twitter:

As seen in this photo, courtesy of tennis journalist Davide Zirone, Paris Saint-Germain soccer star Zlatan Ibrahimovic congratulated Djoker following his advancement to the third round:

Even though the eight-time Grand Slam winner wasn't feeling 100 percent at the conclusion of the match, he took time to give an on-court interview and discussed what was ailing him.

Per Rothenberg, Djokovic explained that the act of sliding on the clay surface is what ultimately caused him discomfort:

While the pain was severe enough to warrant a visit from the trainer, Djoker is not particularly concerned about his status moving forward, according to Adeline Auger of Tennis Trotteur:

With his win, Djokovic will move on to face Australia's Thanasi Kokkinakis in the third round after his victory over fellow Aussie Bernard Tomic.

If Djokovic is able to overcome that challenge, followed by a potential fourth-round match against Kevin Anderson or Richard Gasquet, the stage would be set for an epic quarterfinal showdown against nine-time French Open champion Rafael Nadal.

The French Open is the one Grand Slam title that has eluded Djoker to this point, and it seems likely he will have to defeat Rafa on the red stuff in order to give himself a chance to take the championship.

Doing that will prove incredibly difficult if his groin issue persists, but if it is nothing more than a minor injury, as Djokovic intimated, this marks his best chance yet to take down Nadal.

Djoker has been the superior player on clay all season, and after breezing past Muller in the face of discomfort, his chances of hoisting the trophy at Roland Garros are as strong as ever.

Follow @MikeChiari on Twitter.