BERLIN (AP) Captain Manuel Neuer returned from six weeks out injured to help Bayern Munich complete a domestic double after beating Leipzig 3-0 in the German Cup final on Saturday. [ MORE: Valencia end Barcelona’s four-year hold on Copa del Rey ] Robert Lewandowski scored twice and Kingsley Coman grabbed the other as Bayern claimed a record-extending 19th cup win to make up for the disappointment of losing last year’s final to Eintracht Frankfurt. Bayern coach Niko Kovac, who was in charge of Frankfurt at the time, boosted his chances of keeping his job in Munich after bringing a successful end to what had been a testing season. Neuer, who missed Bayern’s Bundesliga triumph the week before due to a calf injury, produced two stunning saves in either half when a goal for Leipzig might have been decisive. Neuer somehow denied Yussuf Poulsen’s header from close range in the 11th minute, when the ball crashed back off the crossbar, and got the better of Emil Forsberg in a one-on-one after the break, when the Swedish midfielder should have equalized. “You couldn’t write a better script,” Neuer said. Lewandowski opened the scoring with a header in the 29th, Coman doubled the…