Borussia Dortmund forward Erling Haaland scored twice and teenager Giovanni Reyna added another as they cruised past Borussia Moenchengladbach 3-0 in their season opener on Saturday.

The 20-year-old Haaland scored a 54th minute penalty, awarded for a foul on Reyna, and bagged another with a sensationally quick counter-attack and a Jadon Sancho assist as Dortmund utilised their fearsome youthful attacking weapons.

Reyna opened the scoring, after combining perfectly with his fellow 17-year-old Jude Bellingham in the 35th minute.

His first league goal made him the second youngest American to score in the league after Christian Pulisic.

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The hosts, playing in front of a crowd limited to 9,300 fans in their 80,000-capacity stadium due to COVID-19 restrictions, also hit the crossbar with a Sancho header.

Champions Bayern Munich launched their title defence with an impressive 8-0 demolition of Schalke 04 on Friday.