Ligue 1 leaders Monaco extended their best start to a Ligue 1 campaign with a 3-0 victory at home to Bastia on Wednesday, while Paris Saint-Germain kept pace with a 1-0 win at Valenciennes.

Emmanuel Riviere opened the scoring for the hosts before league-leading scorer Radamel Falcao netted twice to maintain Monaco's unbeaten record and return Claudio Ranieri's side to the top of the table after PSG had temporarily gone first.

A fifth win in seven games for the principality outfit moved them onto 17 points, two ahead of defending champions PSG, with Marseille one point further back.

Both goalkeepers were tested early at the Stade Louis II with Wahbi Khazri drawing a pair of saves from Monaco custodian Danijel Subasic, while Bastia's Mickael Landreau had to be at his best to keep out Riviere and Layvin Kurzawa.

However, Landreau's resistance was broken on 39 minutes as James Rodriguez played in Riviere who held off Francois-Joseph Modesto before steering a shot just inside the near post for his sixth goal of the season.

Falcao then scored for the fourth straight game two minutes later as he ran onto Joao Moutinho's through ball before firing past Landreau.

The Colombian added his second of the evening a minute from the end, taking his tally to a Ligue 1 best seven goals, as he pounced on Yannick Ferreira Carrasco's blocked effort to steer beyond a helpless Landreau.

Earlier, PSG's record signing Edinson Cavani netted the only goal at the Stade du Hainaut in first-half stoppage time as Laurent Blanc's side won 1-0 away to struggling Valenciennes.

"We burned a lot of energy in the Monaco match and only had three days to recover. It was a difficult match in all senses," said PSG coach Blanc.

"But the important thing is to have taken the three points because we'll have plenty of matches like that over the course of the season."

Javier Pastore twice went close in the opening stages but both 'keepers were relatively untroubled in a quiet first 45 minutes before Cavani struck two minutes into first-half stoppage.

Zlatan Ibrahimovic, who on Tuesday signed a contract extension tying him to the club until 2016, carried the ball from well inside his own half before picking out the angled run of Cavani, who shot low first time across Nicolas Penneteau into the far corner.

The hosts responded after the break with Marco Verratti forced to clear off the line from a Lindsay Rose header.

Anthony Le Tallec then had Salvatore Sirigu scrambling across his line as his free-kick whistled just wide of the post.

The former Liverpool striker, though, missed an excellent chance to haul the home side level late on as Mathieu Dossevi's effort was deflected into his path but Le Tallec failed to make any contact from six yards out as PSG held on for a narrow win.

Defeat for Valenciennes extended the northerners' losing streak to six, leaving them second from bottom on just three points.

Elsewhere, goals from Salim Arrache and Aboubacar Demba Camara gave Fabrizio Ravanelli's Ajaccio their first victory of the season as they recorded a 2-1 win at home to Lyon.

Martin Braithwaite's 72nd-minute winner handed Toulouse a 1-0 win over Lorient, while promoted Guingamp routed basement club Sochaux 5-1, Nantes beat Nice 2-0 and Bordeaux drew 0-0 with Reims.