Olympique Lyon launched their bid for a seventh successive French league title with a 2-0 home victory over Auxerre.
Baros put Lyon on the way to victory with a 34th minute strike.
Goals from Czech Milan Baros and French international Karim Benzema were sufficient to give new coach Alain Perrin a winning start in the league
Sidney Govou missed two early chances for the champions, shooting wide from Abdul Kader Keita's 14th minute cross and then firing high and wide from Anthony Reveiller's pass 12 minutes later.
Baros made the breakthrough in the 34th minute with a right-footed shot from the center of the penalty area after being supplied by Jeremy Toulalan.
With 20 minutes left Benzema sent a left-footed drive into the top corner after taking a pass from the industrious Govou.
Metz, back in the top flight after winning the Ligue 2 title last season, lost 1-0 at Le Mans.
Serbia defender Marko Basa headed home the only goal of the match in the 27th minute.
Portuguese champions Porto scored three first-half goals to defeat Shanghai Shenhua of China and win the Port of Rotterdam tournament.
Tarik Sektioui opened the scoring after five minutes and Leandro Lima struck twice in three minutes shortly before the interval to seal victory.
Porto edged Liverpool, who fought back from a goal down to draw 1-1 against hosts Feyenoord, on goal difference.
Feyenoord grabbed the lead near half-time when Royston Drenthe netted a rebound after Andwele Slory hit the post.
Steven Gerrard exploited a defensive blunder from Theo Lucius to equalize 18 minutes before time.
Three minutes before time Liverpool goalkeeper Jose Reina saved a penalty from Luigi Bruins after Javier Mascherano had handled the ball. E-mail to a friend