Two years after being humiliated by Barcelona in the Champions League, Paris Saint-Germain turned the tables on the five-time champions with a relentless display of skill, energy and determination.

Angel Di Maria scored two superb goals and top scorer Edinson Cavani grabbed his 34th of a prolific season, with both players scoring on their birthdays as PSG battered Barcelona 4-0 in the first leg of their Round of 16 contest on Tuesday.

Newly-signed winger Julian Draxler got the other one as PSG's irrepressible front trio - a mixture of constant movement, power and pace - tormented Barca.

"We couldn't have imagined a better night. Winning 4-0 against Barcelona on the day of my birthday is incredible," Di Maria said. "It was the perfect match."

Barcelona has grown accustomed to handing out football lessons, thrashing PSG 5-1 on aggregate when they met in the quarterfinals two years ago, but this was a PSG masterclass.

Dreams of a sixth European crown should be put firmly on hold, because Barcelona has a massive task ahead in the second leg on March 8.

That result won't grab the headlines like this emphatic result - one that sends a clear message that PSG is a serious contender this year.

Di Maria, totally out of form for much of the season, celebrated his 29th birthday in style, rifling in an 18th-minute free kick and then skipping past two weak challenges before curling in a superb second from 25 meters (yards) out, 10 minutes after the break.

Continuing his fine form since joining from Wolfsburg last month, Draxler smacked in the second goal late in the first half.

Cavani, celebrating his 30th birthday, drilled home the fourth in the 72nd minute.

"The understanding between the three of them was very high," PSG coach Unai Emery said.

The noise level at Parc des Princes reached deafening proportions as Barcelona cracked under waves of incessant pressure.

"We played a great game individually and collectively," Emery said. "But I still have a lot of respect for Barca and 90 minutes is long. We must keep our concentration for the return match."

Perhaps he was being diplomatic.

Because although Barcelona was supposed to be the favorite, the night turned into a damage limitation exercise, the way it does when weak sides are totally outclassed.

"They were better than us from the start and put us under pressure," Barcelona coach Luis Enrique said. "We couldn't get out of it. We were obviously inferior."

The way Barca lost its shape and composure was completely unbecoming of such a proud club.

Luis Enrique's side was destroyed by a PSG side playing with feverish determination, desperate to prove it belongs among Europe's elite after falling at the quarterfinals in the last four seasons.

This time it looks like the mighty Barcelona won't even reach the last eight, after equaling its worst ever Champions League defeat.

"I'm responsible for this," Luis Enrique said. "We might need to change our shape (for the return leg) but it wasn't really the shape that was to blame."

Emery vowed that his players were not scared of Barca's famed MSN attack of Lionel Messi, Luis Suarez and Neymar, and would impose their game.

How right he was.

Tonight was all about the CDD, as Cavani, Draxler and Di Maria ran the show.

Borussia Dortmund squandered chance after chance, including a second-half penalty, before slumping to a 1-0 defeat at Benfica in their first leg match of the Champions League's Round of 16 on Tuesday.

Kostas Mitroglou scored shortly after halftime and goalkeeper Ederson made some key saves afterward to help Benfica hold on for victory at the Stadium of Light.

Pierre-Emerick Aubameyang missed the penalty in the 58th minute, when his shot was stopped by the Brazilian goalkeeper.

"That's only possible in football, to play this well and to still lose," Dortmund coach Thomas Tuchel said. "Luckily, there's a return leg for such games. It is an extremely complicated result, but I am very proud of how we played tonight. Even though I am very disappointed, I am proud of how we presented ourselves."

Benfica will be looking to reach the quarterfinals for the second straight season in the second leg on March 8 in Germany.

In the other Round-of-16 match on Tuesday, Paris Saint-Germain stunned Barcelona 4-0 in the first leg in France.

Mitroglou broke the deadlock following a corner early in the second half after a header by defender Luisao, who was making his 500th appearance for Benfica. Mitroglou's initial effort was parried by goalkeeper Roman Burki but the striker was able to bundle home the loose ball.

It was Benfica's only attempt on target the entire match.

"We fought, gave our best, and victories are also made of that," Benfica coach Rui Vitoria said. "Congratulations to Ederson too, a keeper who showed his quality once again, this time against a team that scored so many goals in the group stage."

Dortmund's attack had thrived in the group phase, setting the competition's all-time scoring record with 21 goals in six games, but it faltered in Lisbon even though the German side controlled possession throughout the game.

"We should have and could have taken more from this game. We put in a top performance, we created many chances," Dortmund midfielder Julian Weigl said. "A 1-0 defeat is not the best position for the return leg, but we play in our stadium and it is still possible."

Aubameyang's penalty was straight at the middle of the goal and Ederson was able to make an easy save. The goalkeeper had already made two great stops shortly after halftime, and after a long-range shot took a deflection off a defender in the 84th.

"We knew that they had strong and quick players up front," Ederson said. "They created a lot of difficulties for us but we were prepared."

Aubameyang had missed two other great opportunities with shots from inside the area, one in each half, and Ousmane Dembele nearly scored in the first half when his close-range shot was blocked in front of the goal.

Benfica hasn't conceded in four home games and has won 13 of its last 16 matches, with only two losses.

The Portuguese champion had to play without its top forward, Jonas, who didn't recover from a back problem.