The Premier League is currently dominated by Manchester. But it is impossible to know which of the city's two teams will be on top after each fixture.
Both United and City have the same number of wins, draws, points, goals for and goals against. Two contrasting styles, Mourinho's and Guardiola's, who share the common objective of winning and up to now have reaped the rewards in the competition.
While the Portuguese manager opts for complete control and lethal counter-attacking football in the second period, Guardiola favours open games with an uncertain outcome; City can thrash a team or struggle to come back from behind.
At this early stage in the season, said approaches have offered identical results. Both teams have scored 16 goals while only conceding two. City and United are also the only Premier League teams to remain unbeaten after five matches.
Behind them, with a three-point gap between them, Chelsea seek a way to get to the top. They could have closed in on the leaders had they brushed aside Arsenal at home, but Wenger's plucky Gunners put up a good fight.
Citizens and Red Devils will fight again for first place next week, when Mourinho's men pay a visit to Southampton and Guardiola's counterparts host Crystal Palace. An evenly-matched Premier League that is proving impossible to predict.