By Mark Lamport-Stokes THOUSAND OAKS, California (Reuters) - Zach Johnson prides himself on his competitive spirit and he came up with the goods in triumphant style after going head-to-head with Tiger Woods at the Northwestern Mutual World Challenge on Sunday. Having twice finished second to tournament host Woods in the elite limited-field event at Sherwood Country Club, Johnson reversed that position as he safely parred the first extra hole before Woods surprisingly lipped out from five feet to bogey. More...