Moulton Harrox 199-5, Freiston LL 202-7 - Freiston won by three wickets.
Freiston, Leake and Leverton will compete in the South Lincs and Border League Cup final after recording a three-wicket victory at Moulton Harrox on Saturday.
The hosts made 199 for the los of five wickets in their 40 overs, with some strong batting from Matthew Barnett (83), Jack Barnett (37) and Lance Bettinson (21).
But an inspired batting display by Freiston - in which the runs were shared out across the team - saw them reach their target with three wickets to spare.
Freiston will now face the winners of Baston and Skegness Seconds in the final.
Those teams will meet on July 23.