Watch: Fullkrug catches PSG napping for emphatic goal

DORTMUND, GERMANY - MAY 01: Sebastian Haller of Borussia Dortmund celebrates after scoring his team's first goal during the UEFA Champions League semi-final first leg match between Borussia Dortmund and Paris Saint-Germain at Signal Iduna Park on May 01, 2024 in Dortmund, Germany.

Boris Streubel / Getty Images Sport / Getty

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All it takes is one lapse in concentration to get punished.

Paris Saint-Germain's backline fell asleep for just a second in Wednesday's clash with Borussia Dortmund, and Niclas Fullkrug made them pay with the opening goal of the Champions League semifinal tie.

The burly German striker ghosted behind the PSG defense, took down a long ball in stride, and ripped a wicked low shot beyond goalkeeper Gianluigi Donnarumma to give Dortmund a 1-0 lead in the first leg.

(Available to view in U.S. only)

DORTMUND STRIKE FIRST ⚡

Schlotterbeck sends a perfect ball over to the top 👌
Füllkrug makes no mistake 🎯 pic.twitter.com/GJ2jytxpbd
— CBS Sports Golazo ⚽️ (@CBSSportsGolazo) May 1, 2024

(Available to view in Canada only)

THAT IS SENSATIONAL!!! 😍😮‍💨

Pass, touch & finish. Right out of the TOP DRAW!! 👏

Watch the #UCL semi-finals LIVE on https://t.co/6e0eQThQd3 pic.twitter.com/369l8uQmof
— DAZN Canada (@DAZN_CA) May 1, 2024