In the summer of 2016, Pep Guardiola landed in England to join Manchester City from Bayern Munich and kickstart a new era in his rivalry with former Borussia Dortmund coach Jurgen Klopp, who had been in charge of Liverpool since 2015.
After both being key to the Bundesliga's efforts to boost their brand due to the way they revolutionised German football, the two men set foot on English soil and have played a major role in helping the Premier League dominate European football again.
In fact, since 2016 Liverpool and Manchester City have won four of the five Premier League titles, with the Reds also sealing a Champions League trophy and Guardiola's side reaching the final last season.
The transformation of Liverpool and Manchester City
Since his arrival in Liverpool, Klopp gradually transformed a lethargic Liverpool side into a team which would reach two Champions League finals, win one of them and celebrate their first Premier League success in 30 years.
To do so, though, the Reds had to overcome a dominant Manchester City, which under Guardiola have won three Premier League titles, an FA Cup, four Carabao Cups and two Community Shields.
"For us it's an honour to have Liverpool as a rival," Guardiola said ahead of the game between the two teams on Sunday.
"Decades ago we were not rivals to them. For many years we have tried to compete with this legendary club and for us it's an honour. Hopefully for them too.
"It means we are there competing with one of the historic teams in England, alongside United, and that's nice for us."
Helping each other to become better
The 2018/19 title race is undoubtedly one that many Premier League fans will remember for years, as Manchester City had to win all their last 14 games to clinch the title on the final matchday.
Guardiola and Klopp pushed each other beyond their limits as the Sky Blues grabbed 98 points, with the Reds setting a record for the highest point tally (97) of a team that finished runners-up in the Premier League.
"[Klopp] helped me and his teams helped me to be a better manager," Guardiola noted in his press conference prior Sunday's duel.
"He put me at another level to think and to prove to myself what I have to do to be a better manager. That's the reason why I'm still in this business.
"There are some managers, and Jurgen is one of them, who challenge you to make a step forward.
"We have faced each other many times. Sometimes we win and we sometimes we lose, but every game was nice because both teams have the same idea, to go out there to try to score goals."
Liverpool host Manchester City on Sunday at 17:30 CEST at Anfield in what is expected to be the most exciting game of the Premier League's Matchday 7.
Meanwhile, the geniuses of Guardiola and Klopp have turned a modest Premier League duel between Manchester City and Liverpool into the most appealing rivalry in European football in the last few years.
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