Both sides started off well via some nice wing play. Carrasco has caused Klostermann tons of problems and left him exposed on multiple occasions, but Atletico's full backs getting attracted to Olmo & Nkunku has left spaces for bot Angelino and Laimer. Unfortunately, neither side has committed enough players into the box to get on the end of crosses. Atletico eventually decided to sit back and absorb pressure in order to deal with the wing backs, and it's working so far. Leipzig are looking toothless on the attack with very few players making runs past Atletico's defensive line. Poulsen's often the only one looking to get on the end of chances, but he's contained by two defenders. All of that nice interplay between the midfielders, Olmo, and Nkunku's going to waste because of their lack of incision. This has also thrown off Poulsen, who keeps looking inside for goalscoring threats and eventually screws up the pass to his wing backs.
I think Nagelsmann's going to make Leipzig more aggressive in the 2nd half. He'll demand Olmo to make more runs past the defensive line. I also wonder if he'll change Leipzig's attacking shape and put Laimer into more of a midfield role. Laimer's great at making runs beyond the defensive line, so I can see him being moved infield to help with that. On the other hand, they'll miss him defensively on the right wing, so they might just keep him there for the time being. I can also see Nagelsmann pushing Sabitzer slightly wider so that he can get more involved on the attack. That can allow Laimer to make more runs through the middle and Olmo more space in the middle to get the most out of his creativity.
With Atletico, I struggle to see how they can do any better. Ideally, they need to press Kampl immediately and prevent him from settling on the ball. Sabitzer wouldn't be as much of a threat on the ball, so they can give him space whilst cutting out his passing options. Upamecano is there to be targeted, so if they can Diego Costa on him, they can potentially cause some problems for Leipzig. Klostermann's also struggled defending the right flank, so some more wing play there would help them. I'd encourage Renan Lodi to push up and have Carrasco pick up the ball in slightly more central areas to worry Klostermann and drag Upamecano away. Despite all of these suggestions, I expect Atletico to sit back and defend for their lives in the hopes that they can get that one counter to trouble Leipzig.
This tie can still go either way. Leipzig need more runners, and Atletico need to exploit Leipzig's defensive weaknesses more.