Robert Lewandowski scored a hat-trick to leave him on 31 Bundesliga goals this season and seal Bayern Munich's 4-2 comeback home win over Borussia Dortmund on Saturday in Germany's 'Klassiker'. Dortmund raced into a 2-0 lead as Erling Braut Haaland netted twice in the first nine minutes behind closed doors at the Allianz Arena. However Lewandowksi then struck twice, the second