Pep Guardiola says he was pleased with Manchester City's response against Liverpool after they were knocked out of the Champions League by AS Monaco last week.
An incident-packed Premier League clash between two top-four rivals ended with honours even at the Etihad Stadium on Sunday after Sergio Aguero cancelled out a James Milner penalty.
Guardiola's side equalised in the 69th minute when Kevin De Bruyne whipped in an excellent cross and Sergio Aguero slotted home for his 25th goal of the season.
Victory would have carried Liverpool above third-place City, but they remain a point behind them in fourth place, having played a game more and with fifth-place Manchester United closing in from below.
Liverpool should have scored 11 minutes from time when Firmino got behind the defence to tee up Lallana but the England man, wide open as City wrongly assumed he was offside, missed his kick.
Adam Lallana and Sadio Mane spurned clear opportunities to score, with the England global somehow passing up a golden late chance from eight yards out, while Klopp suggested referee Michael Oliver could have awarded further spot-kicks. Before the match, Mourinho had deliberately played down his team's chances at struggling Middlesbrough because of injuries, suspensions and fixture congestion.
"We a phase between 50-70 where we had them and didn't close the game".
The boss, a victor of 21 trophies with Barcelona and Bayern Munich, said: "This is one of the happiest days of my career as a manager". You have to consider the situation we played this game, how we played against them, a top team - they have exceptional players - means a lot to me.
"Give me a few hours and then I'm happy", he said. I think the only very good thing is that we tried until the end, the very last minute and we couldn't [score again].
City were looking to bounce back from Wednesday's surprise Champions League exit at Monaco and they had to come from behind to extend their unbeaten league run to seven games.
"We are one of these sides and that's good".
James Milner has set a new Premier League record for the most games scored in without being on the losing side.
The Blues started the match at lightening pace and, although the quality was not always there, the determination to win this important match in the race for Champions League qualification was there to see from start to finish.