PARIS, Oct 16 (Reuters) - Leaders Olympique Lyon stretched their unbeaten run in Ligue 1 with an exciting 3-2 home win against struggling AC Ajaccio on Sunday.
In Marseille, TV reported that ammonia had been thrown into the dressing room of visiting Paris St Germain two hours before the match which was won 1-0 by the home side. PSG coach Laurent Fournier complained of dizziness but the game started on time.
Four-times champions Lyon, who have not lost a match this season, now have 27 points from 11 games.
They have opened a seven-point gap over second-placed PSG whose defeat by Marseille was the first to their arch-rivals in three years.
Marseille have moved to seventh with 17 points after winning five of their last six matches.
Brazilian striker Fred opened the scoring for Lyon in the 30th minute after taking advantage of an unintentional back pass by an Ajaccio defender and beating goalkeeper Stephane Porato.
Kaba Diawara equalised from the penalty spot five minutes later after being brought down by Brazilian defender Cris.
The hosts went back in front on 50 minutes thanks to a Juninho 20-metre drive but the Corsicans levelled again in the 54th minute after a Tiago own goal.
Ajaccio striker Rafik Saifi had a goal disallowed for handball before French international Sylvain Wiltord grabbed a 69th minute winner after a fine one-two with substitute midfielder Karim Benzema.
At the Stade Velodrome, Marseille dominated throughout the game and were rewarded for their efforts in the 78th minute with a goal by former PSG midfielder Lorik Cana.
From a Samir Nasri corner kick, Cana headed home to beat his former team mate Jerome Alonzo.
PSG had a couple of chances through midfielder Sergei Semak and forward Bonaventure Kalou but both were denied by a fantastic Fabien Barthez, returning from a five-month ban.
Before the game, TV footage showed PSG coach caught up in an ammonia incident, leaving his side's dressing room coughing.
Canal Plus said ammonia had been poured into the Parisians' changing room before their arrival in Marseille and Fournier, who felt dizzy, later had his blood pressure checked.
On Saturday, AJ Auxerre thrashed promoted Troyes 3-0 to move to fourth but Girondins Bordeaux were held to a 1-1 home draw by struggling Sochaux.
Bordeaux, who grabbed their point courtesy of a last gasp equaliser by Argentine midfielder Alejandro Alonso, remain third with 20 points from 11 matches, one point above Auxerre.
Sixth-placed Monaco scored their first home goals of the season with a 3-0 defeat of bottom-of-the-table Metz to give new coach Francesco Guidolin a winning start in the principality.