How old is your battery? I had a similar experience on my Merc 230E. In the mornings though the battery could crank the motor there was not sufficient power to provide a spark at the plugs. After jump starting there was no further problem for the rest of the day as the motor had warmed up and there was no electrical loss at the plugs.
Replacing the battery solved the problem. Also check your alternator that it is charging correctly.
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