Substitute Ryan Colclough scored an 80th-minute equaliser to keep Wigan's League One title bid on course with a 1-1 draw at Bristol Rovers.A 67th-minute replacement for Gavin Massey, Colclough netted with a right-footed shot from the left corner of the box which slithered under the dive of Rovers goalkeeper Sam Slocombe.Rovers had taken a 28th-minute lead when the ball broke to Liam Sercombe 25 yards out and the midfielder strode forward to net with a low right-footed shot that skimmed along the wet surface.A match played in pouring rain saw the home side create the best first-half chances, Ellis Harrison firing wide early on and Kyle Bennett striking a post with a curling right-footed shot from the edge of the box.Wigan goalkeeper Christian Walton made a fine double save on 43 minutes to keep out shots from Sercombe and Byron Moore.Lee Brown hit a post for Rovers in stoppage time, but the visitors held on for a hard-earned draw to stay a point ahead of second-placed Blackburn.