Image source, AP

Djokovic guides a big backhand down the line and though Raonic gets to it, the ball finds the net to give the Serb the mini-break. Out comes the fist pump but the joy is short-lived as Raonic wins only his sixth point on the Djokovic serve in this set to break back.

Crucially, Djokovic wins the next point and then breaks again to bring up two set points. The first disappears as a backhand slice ends up in the net. But Djokovic is not to be denied in the next, the Serb firing a brilliant kick serve out wide that Raonic can only send into the tramlines.

Raonic will have to do it the hard way if he is to join compatriot Eugenie Bouchard in the semi-finals.

Djokovic had lost just five points on his serve in this set and he maintains that record as they get to changeover locked at 3-3.

Raonic manages to hold serve in the 12th game this time round which means we're heading for a tie-breaker.

Ernests Gulbis' irresistible form continues as the Latvian breaks twice in the second set to take a two set lead against sixth seed Tomas Berdych. The 25-year-old is now one set away from his first-ever Grand Slam semi-final.

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Great serving from Djokovic and the number two seed and six-time Grand Slam champion eases through another service game to love. Raonic will once again serve to stay in the set.

Piers Newbery
BBC Sport at Roland Garros

"It's surprising to see Djokovic, a set up, looking so frustrated by the serves whistling past him as he knew this was coming. Meanwhile, the schedule for Wednesday is out and, as expected, Murray v Monfils knocks last year's final repeat, Nadal v Ferrer, off the main Chatrier stadium. It will be Murray's first match this year on Chatrier, but he had a hit here this morning and will doubtless be back ahead of the approximate 15:00 BST start tomorrow."

Some great scrambling from Djokovic, but he can't get enough on the returns to gain control of the point and Raonic levels the set once more.

Raonic chooses to make a rare foray to the net, but it's easy pickings for Djokovic who easily passes the Canadian with a backhand down the line to clinch the game to 15.

Three aces and a textbook backhand volley sees Raonic win the game to love.

Djokovic loses his footing but manages to steady himself and then fire a forehand winner which hits the corner for 40-15. A forehand error from Raonic in the next hands the Serb the game.

Ari Samet: I totally agree with Levi Gould, Djokovic's defence is one of the best in the game, it will take something exceptional to break past Djokovic!

Image source, Reuters

Raonic has won 80% of the points when he gets his first serve in, but just 27% on his second serve. In contrast, Djokovic has won 72% on his first serve and 75% on his second. Djokovic gets a sniff of a breakthrough at 30-30, but Raonic then hammers down an ace and wins the next point to close out the game.

Lovely exchange at the net mid-way through the game with Raonic whipping up a delightful cross-court forehand passing shot to reduce the deficit to 40-30. However, the Canadian goes long in the next point and Djokovic moves back in front.

Djokovic can't make any in-roads on the Raonic serve and the Canadian cruises through the game to love in double-quick time.

It's another easy hold for Djokovic, the Serb closing out the game to 15 with a backhand winner. The six-time Grand Slam champion has never won the French Open, coming closest in 2012 when he lost to Rafael Nadal.

Raonic's serve returns to form in his opening service game of this set, the Canadian pulling Djokovic out of court with some quick, wide serving. The Serb struggles to get hold of any of them and loses the game to 15.

Djokovic makes the perfect start to the second set, racing through his service game to love.

Andrew Neill:, external Djokovic to win in straight sets with at least two tie breaks.

Piers Newbery
BBC Sport at Roland Garros

"A huge reaction from Djokovic after he does the seemingly impossible and breaks Raonic's serve to take the set. Coach Becker does his best Ivan Lendl impression and remains calm and seated, dark glasses hiding his thoughts, before standing during the changeover and surveying the scene. Three times a semi-finalist here, he never quite made it. His job now is to get Djokovic over the line."

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Outstanding winner from Novak Djokovic, the Serb whipping a backhand down the line of a pretty heavy forehand from Raonic to bring up break point. Raonic then nets a volley and Djokovic takes the set.