What happened at the Roland Garros on Day 4?

Former world number one Novak Djokovic reached the third round of the French Open with a 7-6 (7-1), 6-4, 6-4 victory over qualifier Jaume Munar.

Despite winning the match in straight sets, the 31-year-old Serbian faced a stern challenge from the Spaniard.

Djokovic will now face 13th seed Roberto Bautista Agut in the next round.

World number three Alexander Zverev outclassed Serbia's Dusan Lajovic 2-6, 7-5, 4-6, 6-1, 6-2 in Paris to reach the third round of the clay court major.

The German had to toil hard to advance into the next round with Lajovic taking the game to five sets.

Zverev will now face Bosnia-Herzegovina's Damir Dzumhur in the third round.

World number five Grigor Dimitrov struggled but finally made it to the next round of 2018 French Open.

He faced a tough competition from 21-year-old American Jared Donaldson.

Dimitrov won the five set encounter 6-7 (2-7), 6-4, 4-6, 6-4, 10-8.

He will now play against Spanish veteran Fernando Verdasco in the next round of the tournament.

World number one Simona Halep survived a scare to reach the second round of the French Open.

The Romanian nearly fell to Alison Riske but recovered after a slugging start.

She sealed a 2-6, 6-1, 6-1 victory.

26-year-old Halep will now meet American Taylor Townsend in the second round.

Reigning US Open champion Sloane Stephens moved into the third round at Roland Garros with a 6-2, 6-2 victory over Polish qualifier Magdalena Frech.

Stephens had 17 winners to 13 unforced errors, thus making light work of her opponent.

Stephens will be up against Italian Camila Giorgi in the next round.