William Mouw was cruising along at the American Express—until he came across the tournament's infamous bunker on the 16th hole.

PGA Tour newcomer William Mouw had a par-5 to forget Friday during The American Express tournament. Mouw sported a solid 2-under par heading into the 16th hole at the Pete Dye-designed PGA West Stadium Course in La Quinta,

Ahead of this week's American Express, Johnson Wagner demonstrated the daunting shot that faces tour pros who find the infamous bunker to the left of the green on PGA West Stadium Course's 16th hole.