Liverpool beat Atletico Madrid 2-0 at Anfield, maintaining a perfect start to the Champions League and securing a chance to reach the round of 16.
On 19 October, Liverpool beat Atletico 3-2 at the Wanda Metropolitano, with Anthony Griezmann sent off and Mohammed Salah scoring the winning goal in a penalty shootout.
In the opening 20 minutes, Diogo Hotta and Sadio Mani created a 2-0 lead for the home team, with Trent Alexander-Arnold scoring two goals to give Klopp's side a 2-0 lead.
"Our first goal is to break through this group of people. I didn't expect we would be eliminated after four games, but the boys did it and it was what they deserved," Liverpool boss Klopp said.
Atletico suffered another setback before half-time, when Felipe was shown a red card for a foul on Mani, who appeared to have scored straight, leaving the rally club with only 10 players.
Diego Simeone's Atletico Madrid tried to get back into the game, but Liverpool took control of possession and took all three points.
Liverpool scored 12 points in the first group, locked to the round of 16 and tried to win four games, while Atleti scored four points with Porto, a third-hand man and a second draw after ac Milan in the early days of the day.
Liverpool players celebrate after scoring in the Champions League match against Atletico Madrid.
A draw was enough to get Liverpool to the round of 16, but from the start, Klopp's side seemed to be full of victories.
Horta took the lead for home in the 13th minute when Alexander Arnold crossed from the right and scored at the back post.
Eight minutes later, Alexander Arnold again provided an assist for the team when his low shot was brilliantly picked up by Sadio Mani, who crossed Jane O'Baek.
In the 36th minute, Felipe deliberately tripped Mani and was sent off with a red card, Spain's troubles were further exacerbated.
Shortly after half-time, Horta considered his second goal and Liverpool's third, but after a var assessment, the goal was ruled out due to offside.
Former Liverpool striker Luis Suarez also had a deflected shot that beat Allison Becker, who was judged offside by var, but the Spanish champions had no complaints about the result.
The only thing that went against Klopp was Brazilian striker Robert Firmino's hamstring injury in the second half.