* Australian says deft short game saved score * Piercy confident after U.S. Open performance * Five others within three shots (Adds details, quotes) July 2 (Reuters) - Jason Day hit only three fairways in a wayward driving display but the world number one scrambled well enough to earn a share of the third-round lead with American Scott Piercy at the WGC-Bridgestone Invitational in Akron, Ohio on Saturday The 28-year-old Australian carded 69 for a five-under total of 205 to match U.S. Open runner-up Piercy, who shot 67 despite a bogey after an errant tee shot at the closing hole at difficult Firestone Country Club. The co-leaders have a one-stroke lead over Swede David Lingmerth (69), with American Brian Stuard (67) two strokes behind in the World Golf Championships event. More...