Alloa Athletic will take a commanding lead into Sunday's second leg of their play-off final against Berwick Rangers. Goalkeeper Allan Creer denied the Third Division visitors with a fine save from a Gareth Hutchison diving header.
But Jamie Stevenson was pulled down by David Murie and Tony Stevenson fired home from the penalty spot.
Paul McLeod fired in the second from eight yards, Chris Townsley headed the third and John Ovenstone nodded in the fourth for the Division Two outfit.
Alloa: Creer, Anthony Stevenson, Ovenstone, Townsley, Bolochoweckjy, McColligan, James Stevenson (Nicolson 84), McGeown, McLeod, Ross Hamilton (Grant 80), Sloan.
Subs Not Used: Forest, Graeme Brown, Ferguson.
Goals: Anthony Stevenson 42 pen, McLeod 45, Ovenstone 79, 89.
Berwick: O'Connor, Murie, Horn, Stephen Manson (Paliczka 56), Cowan, Connelly, McLeish, Swanson, Hutchison, Haynes, Little (Ramsay 31).
Subs Not Used: McGarty, Lucas, Connon.
Booked: Horn, Hutchison, Haynes.
Att: 975
Ref: S Conroy