Liverpool trailed at Wembley and showed great heart and determination to get back into the cup final. At times, the Reds looked irresistible as they bossed City about. At others, they rode their luck as Man City's class shone through.
But one Liverpool star - unfortunately for all involved with the club - didn't show much heart, determination or ability overall.
It seems harsh to kick any Liverpool player when they're down, especially when you consider the heroism of Lucas Leiva and co.
Yet what exactly did Alberto Moreno offer the Reds on Sunday?
Apart from committing a foul that should have led to a penalty and being (sigh, yet again) caught out of position for the goal, the Spaniard was woefully poor for Liverpool when it mattered most. They were better when he was taken off.
Jon Flanagan and Brad Smith can play at left-back for Liverpool and maybe Klopp should now consider them for the rest of the season. Moreno was the weak link for the Reds both defensively and offensively against Manchester City - and not for the first time this campaign.
The 23-year-old found himself in more space than any Liverpool team-mate in the first half yet did nothing with the ball time after time. City probably knew he was Liverpool's smallest threat.
Then, in the second half, either through Manuel Pellegrini's instructions or his own instinct, Aguero pulled to the right-hand side and targeted Moreno. He knew the Spaniard's positioning at the back is non-existent and he caught him out for the goal, setting Fernandinho up to net.
It wasn't that Moreno was unlucky, though. Goalscorer Philippe Coutinho was unlucky to have missed his penalty (as bad as it was) and Simon Mignolet was unlucky that, despite three world-class saves, his one mistake led to a goal.
Moreno wasn't unlucky, Moreno was ineffective and, most of all, bottled it during the big occasion. That's something the 23-year-old has done before and, unfortunately, looks like he will do again at Anfield. Klopp's biggest worry.