Striker Niclas Füllkrug gave Borussia Dortmund a slight advantage in their Champions League semi-final with Paris Saint-Germain after his first-half goal sealed a 1-0 home win in Wednesday's first leg.
Poacher Füllkrug pounced on 36 minutes after barely touching the ball beforehand as Dortmund began to dream of a second title after their 1997 triumph.
PSG's Kylian Mbappe saw a second-half effort cannon back off a post but Dortmund clung on to set up an intriguing second leg at the Parc des Princes next Tuesday.
Bayern Munich drew 2-2 with record winners Real Madrid in the first semi first leg on Tuesday.
Dortmund are in their first Champions League semi-final since 2013, when they progressed to an all-German final at Wembley which they lost to Bayern. This season's final is also at the famed London stadium and a repeat pairing is still possible.
PSG, who failed to win the big prize by recruiting big names such as Neymar and Lionel Messi, have switched focus to a more organic business model with younger players but now face a tough second leg.
They were beaten by Bayern in their only final appearance in 2020 when ex-Dortmund coach and current Bayern manager Tuchel bossed the Parisians.
