After defeat at the hands of Peel last weekend, Canada Life Premier League leaders Old Boys face another stern test of their title aspirations at Blackberry Lane this afternoon (Saturday).
The visitors are fourth placed St Mary's who are only two points behind their opponents and have a game in hand.
Second placed Laxey travel to Corinthians.
The team best placed in the table are unbeaten Champions St George's.
They are third, having played fewer matches than all their rivals, and welcome Gymns to Glencrutchery Road.
Elsewhere, bottom side Ayre host in-form Peel, St John's visit Rushen and Ramsey tackle Ramsey Youth Centre in a derby clash at Ballacloan Stadium.