AKRON, Ohio (Reuters) - South African Retief Goosen, helped by a spectacular chip-in for birdie at the 11th, grabbed a one-shot lead in Thursday’s opening round at the WGC-Bridgestone Invitational. The twice former U.S. Open champion took advantage of calm morning conditions at Firestone Country Club to card a four-under-par 66, a score which held up in the afternoon. Goosen birdied five of the first 11 holes to forge two strokes clear before collecting his only bogey of the day at the par-three 15th where his tee shot ended up in a plugged lie in a greenside bunker. He then parred the last three holes to finish one ahead of compatriot Tim Clark, Fiji’s Vijay Singh, American Zach Johnson and Swede Daniel Chopra. Singh, like Goosen, also got to five-under before double-bogeying the last for a 67. American Stewart Cink, the 2004 winner, and world number two Phil Mickelson were among a group of 14 players bunched on 68 while British Open champion Padraig…