Bourne claimed the local bragging rights with a three-wicket win over Market Deeping in the Readers Lincolnshire ECB Premier League at Abbey Lawn on Saturday.
It took an unbroken half-century stand for the eighth wicket between Carl Wilson (63no) and Jack Berry (26no) to steer the home side past Deeping’s 199.
Wicket-keeper Wilson had earlier been involved in a controversial caught behind decision which saw off Emile Kriek for just seven.
Captain David Gillett (33) and Ajaz Akhtar (32) top-scored for Deeping as seamer Martin Shillito claimed 4-47 for Bourne.
Meli Adatia bagged 4-76 for Deeping but Bourne avenged a defeat earlier in the season at Outgang Road and look set to finish higher than their deadliest rivals.
Bourne are third, 17 points ahead of sixth-placed Deeping with three matches to go.
Meanwhile, Spalding could be relegated next weekend.
Their cause is now hopeless after a crushing nine-wicket defeat at home to Skegness. Josh Newton scored 50 of Spalding’s 179-9.