Players worried that the mud will stick at U.S. Open (Reuters)

By Larry Fine ARDMORE, Pennsylvania (Reuters) - Heavy rain at this week's U.S. Open has raised the question of whether mud balls could affect the outcome of the championship. Despite two days of warm, drying weather after more than six inches fell on the Merion course, more rain was forecast for Thursday's opening round. When the ground is so heavy, it is not uncommon for mud to stick to balls hit in the fairway, making it harder to control the next shot. Graeme McDowell, the 2010 U.S. ...