Havret turned professional in 1999 and won a place on the European Tour at the 2000 Qualifying School.

He finished 60th on the Order of Merit in 2001, his rookie season, recording a maiden tour victory at the Italian Open.

Havret's biggest win to date came in the 2007 Barclays Scottish Open at Loch Lomond, where he overcame major winner Phil Mickelson in a playoff.

In August 2008, Havret recorded a second tournament victory in Scotland (third overall), leading the Johnnie Walker Championship at Gleneagles at the end of every round in recording a one shot win over Graeme Storm.

As a qualifier and ranked 391 in the world, Havret was the runner-up at the 2010 U.S. Open at Pebble Beach Golf Links, California, finishing one stroke behind Graeme McDowell.