The Pilgrims came from behind to defeat FC Halifax Town 2-1 at the Jakemans Community Stadium.
Flynn Slater equalised for the Pilgrims - with Jaine scoring the winner - after Halifax had taken the lead from the penalty spot.
Boston (3-4-2-1): Jake Lovelace; Oskar Rajski, Owen Sheriff, Taylor Jaine; JJ Ward (Patrik Bad 10, Kelton Robinson 78), Jake Henderson, Han Stevens, Mark Williams (Lucas Stubbs 70); Jack Waddington, Rueben Fogg; Flynn Slater (Jake Higginbottom 65). Sub (not used): Josh Doran.
Referee: Alistair Wilson.