Graeme McDowell finishes with a 77 at Houston Open

Graeme McDowell

Graeme McDowell could only manage 63rd place in the Houston Open after shooting a disappointing five-over-par 77 in Sunday's final round.

The former US Open champion from Portrush suffered a double-bogey seven at the fourth and he had six bogeys to go with three birdies.

McDowell finished the tournament at Redstone on one over.

Hunter Mahan claimed a single-stroke victory over Sweden's Carl Pettersson, finishing on 16 under par.