A few minutes later, Vrsaljko went in for a late challenge on Lacazette - and Atletico star looked stunned when the referee Clement Turpin shown him a second yellow card, the fifth fastest sending off in Europa League history.
The second leg comes up next Thursday at the Wanda Metropolitano in Spain.
That was until eight minutes to go when Atletico found a potentially-decisive equaliser.
It was all going so well for Arsenal until Laurent Koscielny kicked the ball into his own face...
It was the next-best start that Arsenal could have hoped for, besides an early goal of course.
Kim and Moon to hold historic inter-Korean summit
This is the third such meeting between the two since the Korean War-the other two being in 2000 and again in 2007. During the expected summit, Trump said he expects to talk with Kim about denuclearization.
Deputies took cover during Parkland massacre
In another part of his report, Wilkins writes he saw four Broward County sheriff's deputies parked on the road outside the school. The BSO training manual lists the first priority for deputies as finding and stopping the shooter rather than securing the scene.