Donald's "solid" day at Open marred by two bad swings

England's Luke Donald hits from the rough on the 18th green during the third round of the 2013 U.S. Open golf championship at the Merion Golf Club in Ardmore, Pennsylvania, June 15, 2013. REUTERS/Adam Hunger

ARDMORE, Pennsylvania (Reuters) - Two bad swings on the last two holes at Merion Golf Club cost Luke Donald the outright lead at the U.S. Open on Saturday after he had played superb golf in difficult conditions during the third round.

A stroke ahead at two-under par, the English world number six bogeyed the par-three 17th after hitting a two-iron off the tee into a bunker, then used the same club to end up in a poor lie in heavy rough at the 18th on the way to a double-bogey six.