Schalke 04 and Hamburg shared the points in a 3-3 thriller on Sunday as new-signings grabbed the limelight on the opening weekend of the Bundesliga season.

Both defending champions Bayern Munich, who beat Moenchengladbach 3-1 on Friday, and Borussia Dortmund, who won 4-0 at Augsburg on Saturday, picked up wins on the opening weekend of the new season.

Schalke's new-signing Adam Szalai scored the Royal Blues' crucial third goal to share the points with Hamburg while Gabon forward Pierre-Emerick Aubameyang marked his Dortmund debut with a hat-trick.

Mainz's Shinji Okazaki of Japan and Leverkusen's South Korea star Son Heung-Min both also scored on their respective debuts for their new clubs.

Schalke took the lead at home to Hamburg when Holland striker Klaas-Jan Huntelaar struck after just 84 seconds before compatriot Rafael van der Vaart netted a 12th-minute penalty to level for the guests.

Striker Maximilian Beister produced a bullet header on 24 minutes to put Hamburg in front before Huntelaar levelled right at the end of the first half making it 2-2 at the break.

Ex-Dortmund defender Lasse Sobiech then headed the hosts ahead just after half-time before Hungary's Szalai, who joined Schalke from Mainz in the summer, pounced on a mistake by Hamburg goalkeeper Rene Adler on 72 minutes to share the points.

Earlier, fellow new-boy Okazaki netted in Mainz 05's 3-2 home win over his ex-club VfB Stuttgart -- who he left last month.

Mainz picked up three points when Germany midfielder Nicolai Mueller netted goals either side of Okazaki's 65th-minute strike.

Mueller scored his first after just 14 minutes, but Bosnia striker Vedad Ibisevic levelled just two minutes later for Stuttgart.

Okazaki, who joined Mainz on July 1 in a three-year deal after two years at Stuttgart, and slotted home his team's second when he converted a cross from Czech Republic defender Zdenek Pospech before Meuller made it 3-1, 12 minutes from time.

Stuttgart's Martin Harnik gave his side hope with eight minutes left to make it 3-2, but hosts Mainz hung on.

On Saturday, Aubameyang, 24, showed why Dortmund paid French League Cup winners St Etienne 13 million euros (US$17.3m) for him as he became the sixth player in Bundesliga history to hit three goals on his debut in Borussia's 4-0 win at Augsburg.

Poland striker Robert Lewandowski converted a penalty in the dying stages to complete Augsburg's misery.

South Korea's Son also netted on his first competitive appearance for Champions League hopefuls Bayer Leverkusen in their 3-1 win at home to Freiburg.

Hertha Berlin marked their return to the top-flight after a year's absence with a stunning 6-1 rout of Eintracht Frankfurt.

Colombia striker Adrian Ramos and Tunisia forward Sami Allagui each scored twice in the hammering at Berlin's Olympic Stadium while a first-half penalty from Eintracht Frankfurt midfielder Alex Meier was all the guests could muster.

Hanover 96 enjoyed a 2-0 win over Wolfsburg, who finished with nine men after both midfielder Maximilian Arnold and Swiss defender Timm Klose were sent off.

Hoffenheim were held to a 2-2 draw at home to Nuremberg while Werder Bremen edged newly-promoted Eintracht Braunschweig 1-0 with Austria midfielder Zlatko Junuzovic hitting the 82-minute winner.