If their rivalry as coaches in Spain is anything to go by, Jose Mourinho will emerge victorious, and possibly by a big margin, when his Chelsea side play Manuel Pellegrini's Manchester City at Stamford Bridge on Sunday.
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Portuguese Mourinho succeeded Argentine Pellegrini as Real Madrid coach in May 2010 and after Pellegrini re-surfaced as Malaga's manager five months later, they faced each other seven times in La Liga and the Kings Cup in two and a half seasons.
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Mourinho emerged on top in five of their seven encounters, including 7-0 and 6-2 La Liga drubbings, before they both left Spain for England at the end of last season.
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The Premier League is a far more unpredictable competition than La Liga and they will meet on Sunday with little to choose between them on current form.
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Chelsea are second on 17 points, City are fourth on 16, both have won their last two league matches by convincing scores and both won away in the Champions League this week with Chelsea beating Schalke 04 and City winning at CSKA Moscow.
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Both teams have also been tipped as potential champions and both at the very least are targetting a top four finish but City have the better recent record having won four and drawn one of their last five matches against Chelsea including last season's Community Shield and FA Cup semifinal victories at Wembley.