Totesport League D2, Riverside: Durham 116-2 (26.2 overs) bt Leicestershire 113 (32.2 overs) by eight wickets
Australian bowler Mick Lewis bowed out on a high note for Durham with four for 13 in their home win over Leicestershire at Chester-le-Street.
Lewis, who will make way for countryman Brad Williams, shone as the visitors slipped out of the top three.
Leicestershire struggled with only Darren Robinson offering resistance before he was ninth out for 30.
Although Durham found the reply tough going early on, Paul Collingwood finished the task with 51 not out.
Durham announced on Tuesday that Williams, a 30-year-old paceman who has played in four Tests, will take over as the second replacement for the injured Ashley Noffke.
Lewis has to return to Australia as a witness in the manslaughter trial surrounding the death of his former Victoria coach David Hookes.