
With overnight leader Chris Gane teeing off in the afternoon, along with closest challengers Lloyd Saltman and François Delamontagne, the trio advanced to three under - two behind England's Gane.
Three-time European Tour winner Haeggman started with consecutive gains and recovered from a double bogey at the 13th with a birdie at the next to be one under at the turn on the stunning Seve Ballesteros-designed Porto Santo Golfe.
Englishman Slattery posted three birdies in his first four holes and remained three under through eight, while Italian Colombo mixed two birdies with a bogey in his first six holes as the trio moved into a share of fourth place.