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How does one stop Kylian Mbappe?
Dozens of defenders have tried over the years and it wouldn't be unfair to say the vast majority have failed.
Mbappe will look to put Arsenal's defenders to the sword on TuesdayCredit: GettyThe French superstar can burn rivals with his electric pace but also boasts a sixth sense when it comes to being in the right place at the right time inside the box.
It's why he has scored 32 goals in 46 appearances across all competitions for Real Madrid, seven of which have come in the Champions League.
The World Cup winner will be desperate to add to that tally when Los Blancos travel to the Emirates on Tuesday for the first leg of their quarter-final tie against Arsenal.
Given Mbappe has played through the middle for Real Madrid this term, it means the unenviable task of keeping him quiet will fall to centre-backs William Saliba and Jakub Kiwior.
Saliba will certainly have felt more confident about the looming battle with Mbappe had regular centre-back partner Gabriel been fit.
After all, the pair had played a starring role in Arsenal boasting the best defensive record in the Premier League this term.
However, the Brazilian has been ruled out for the season with a hamstring injury.
It means Kiwior, who has started ten out of a possible 46 games this season, is extremely likely to line up next to Saliba.
So, how do Kiwior and Saliba stop Mbappe on Tuesday?
Well, according to former centre-back and Arsenal great Martin Keown, it will most certainly be a collective effort.
Keown believes Arsenal's defenders can't afford to be left one-on-one with MbappeCredit: talkSPORTKeown also hoped Arsenal learned a lesson from when Newcastle's Alexander Isak ran the Gunners' backline ragged during the second leg of the Carabao Cup semi final.
Because if they haven't, Mbappe could have a night to remember at the Emirates.
"You do it together as a back four," Keown told talkSPORT.com.
"Arsenal like to press. It's where you press and making sure you control him [Mbappe], he doesn't control you.
"We did see a situation against Isak for Newcastle where they had a lot of players running into space. Maybe Real Madrid have looked at that.
"Arsenal can go and sit very deep and then they're harder to break down. But it's initially when you lose that ball, whether or not you're going tight to your man or whether you're pushing up as a team. So that needs to be worked out.
Saliba knows Mbappe well given they play international football together for FranceCredit: Getty"And I think by and large Arsenal have done that very well, done that better than anyone else in the Premier League so far this season. Their defensive record is outstanding."
But as well-prepared as Arsenal can be, Keown knows Mbappe can turn a game on its head.
And if it isn't the Frenchman, Madrid are not short on other players who can... and will.
"It will come down to a moment of brilliance," Keown said.
"There will be those one-v-one situations and it's about picking up the rhythm of Mbappe.
"He's usually flat out. You're pressing the green light and you're going for it.
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"Top players all around him. Rodrygo and Vinicius, they stop on a six-pence, they've got ABS brakes and then they run like the wind. So it's how they use their pace.
"And you don't really want to be isolated. So Arsenal need to get bodies around to protect.
"But they're capable of causing what would be a major upset. Because Real Madrid always seem to find a way to win.
"And it's about time they went out early in a competition."
Unfortunately for Keown, Madrid making an early Champions League exit is a rather rare occurrence.
Madrid have failed to reach the semi-finals of Europe's marquee club competition just twice in the last 15 years.
Real Madrid squeezed into the last eight thanks to a penalty shootout win over AtletiCredit: GettyIn that span, Los Blancos went on to win the Champions League a staggering six times, including twice in the last three seasons.
As for Arsenal, they have not reached the final four in the Champions League since 2009.
However, with Madrid coming off a shock 2-1 loss to Valencia on Saturday and having failed to keep a clean sheet since February 26, the time is ripe for the Gunners to spring a surprise on the Spanish giants.