PARIS, Sept 15 (Reuters) - A Karim Benzema hat-trick earned Olympique Lyon their fourth Ligue 1 win in a row on Saturday, the six-times French champions thrashing Metz 5-1. The France striker was on target for the visitors in the fifth, 36th and 39th minutes as Lyon moved up to second in the table with 15 points from seven games. Alain Perrin's side, who scored a fourth through midfielder Hatem Ben Arfa and a fifth thanks to Juninho, trail Nancy by a point after the leaders lost 1-0 at Racing Lens. Ivory Coast striker Aruna Dindane converted a penalty on 69 minutes to give Lens their first home goal since April 26 and their first victory of the season. Girondins Bordeaux remained third after a David Bellion goal secured a 1-1 draw at Lille. Yohan Cabaye had opened the scoring after two minutes. CHAMAKH OFF New signing Patrick Kluivert failed to make an impact for Lille after coming off the bench in the second half. Bordeaux had Marouane Chamakh sent off in the 58th minute. Valenciennes dropped to fourth after Stephane Sessegnon and Tulio De Melo gave Le Mans a 2-0 home win. Olympique Marseille slumped to a 2-1 home defeat by Toulouse in a game featuring two red cards. The visitors went ahead through Achille Emana and doubled the lead before the break thanks to Johan Elmander. Marseille pulled one back through Ronald Zubar in injury time. Julien Rodriguez, the Marseille captain, was dismissed in the 65th minute for a rough tackle and nine minutes later Toulouse defender Herita Ilunga was sent off for a second yellow card after taking too long to deliver a throw-in. Marseille, who host Besiktas in the Champions League on Tuesday, have yet to win at home this season. Albert Emon's side, who were booed off, are 15th with seven points. On Sunday, Monaco can join Nancy on 16 points by beating Paris St Germain while Lorient meet injury-hit Stade Rennes.