Roger Federer returns the ball to Damir Dzumhur on Friday at the French Open in Paris. Photo: AFP

Roger Federer continued his smooth progress at the French Open on Friday with a straightforward 6-4, 6-3, 6-2 defeat of Bosnian Damir Dzumhur to reach the fourth round.

Swiss Federer has won all nine sets he has played at Roland Garros this year as he attempts to win the title for a second time and extend his Grand Slam haul to 18.

Dzumhur, 10 years younger than Federer, tested his idol on occasion, showing a nice line in drop shots, but he never really threatened to detain the second seed for too long.

Federer broke serve in the fifth game, which was sufficient to bag the first set.

A majestic backhand pass gave Federer a break at the start of the second set, but then he became a little sloppy and was broken when serving at 5-2.

He hit back immediately to move two sets ahead and rolled through the third with ease.

Federer lost to Latvian Ernests Gulbis in the fourth round last year.

Dzumhur though was pleased with the way he played throughout, which was just as well as he had a big audience watching his every move back home.

"It's a little bit strange, but a few people from Bosnia told me that today everybody was in cafes or in homes, ­nobody in streets, watching me," he said.

"I am playing just third round of Grand Slam, but for Bosnia it's (like) our football team playing finals of Champions League, it's like that.

"So I'm happy that all the people were with me today, that I had a lot of friends coming, came to watch me today on court, and of course my family and my coach."

Following a successful junior career which saw him rise to third in the world rankings, Dzumhur turned pro in 2009 and he became the first player from his country to play in a Grand Slam tournament when he reached the Australian Open third round last year.

He has steadily moved up the ATP world rankings to just outside the top 100 currently but still plays most of his tennis on the second-tier ­Challenger Tour.

Still, he harbors hopes of breaking into the top 60 by the end of this year and intends to move on from there.

Also on Friday, ­women's defending ­champion Maria Sharapova passed her first serious test with flying colors, dismissing ­Australian 26th seed Samantha Stosur 6-3, 6-4 to reach the last 16 on Friday.

The second seed from Russia had too much poise and pace for Stosur, runner-up in 2010 and twice a semi­finalist, whose heavy top-spin game can be a handful on clay.

Sharapova, who played in the last three French Open finals, winning two, broke four times to seal a convincing win when Stosur fired a forehand wide.