Jose Mourinho had the most impressive win ratio in his debut season, closely followed by another Chelsea manager in Carlo Ancelotti.
Shockingly, Arsene Wenger won less than half of his games in the 1996/97 season with Arsenal.
David Moyes: 54%
Jose Mourinho (2004/05): 77%
Arsene Wenger: 47%
Rafa Benitez: 47%
Carlo Ancelotti: 74%
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