The Pilgrims drew 2-2 with Lincoln United at the Jakemans Community Stadium – but succumbed 3-2 on penalties, despite successful conversions from Patrik Bad and Rueben Fogg.
Flynn Slater had opened the scoring for the Pilgrims, with Oscar Jenkins and Luke Horne turning the tables for the Whites – only for Taylor Redman to force penalties with a 90th minute header.
Boston (3-5-2): Jake Lovelace; Taylor Redman, Taylor Jaine, Lucas Stubbs (Mark Garner 89); JJ Ward, Jake Henderson (Liam Sutton 89), Han Stevens, Rueben Fogg, Josh Doran (Patrik Bad 76); Krisztian Gagyi, Flynn Slater. Subs (not used): Kelton Robinson, Kyle Featherstone, Finley Rodgers, Cameron Fox (gk).
Referee: Istvan Mod.
Attendance: 405.