Lancashire - fresh from beating Roses rivals Yorkshire on Wednesday - kept the pressure on in second place, beating Durham by a convincing 39 runs.
Mal Loye's 89, built around 10 fours and two sixes, set the pace as the visitors had first knock at Chester-le-Street.
Gareth Breese's three for 19 ensured it was not more but the Dynamos' reply failed to get off the ground and they were all out for 141 with 3.1 overs to bowl.
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