Boston United were beaten 2-0 in their Football Conference Youth Alliance encounter as Mansfield consolidated their position at the summit of the division.
The Pilgrims squandered a number of presentable chances as their hopes of causing a mini upset were dashed by the table-topping Stags.
Boston (4-3-3): Jamie Bradley; Daniel Worthington, Josh Spencer, Ollie Price (Joe Cain 55), Jordan Sowerby; Miles Lynch, Jacob Pease, Aaron Eyett; Leon Squire (Corey Newman 55), Liam Moran (Harry Bunce 65), Bradley Easey.