Twenty-nine-year-old Dustin Johnson didn't wait long to extend his impressive streak of claiming at least one PGA Tour victory in every season since joining the Tour directly out of college.  Having previously logged a total of seven victories since 2008, he grabbed his first 2014 triumph while the calendar still read 2013, riding some inspired golf - and a well-timed eagle at the 70th hole - to a three-shot triumph at the newest of the World Golf Championship events, the WGC-HSBC Champions in China.  After opening with a 69, Johnson siezed the halfway lead on the back of a Friday 63, then appeared on the verge of running away on Saturday before double-bogies at both the 10th and the par-5 18th clipped a potential seven-shot lead down to three.  An opening bogey on Sunday added another brief flash of doubt, and on a day where benign conditions allowed a number of world-class players to make a run, Johnson actually trailed Ian Poulter by one through 12.  Back-to-back birdies at the 13th and 14th put him back on top, however, setting up the coup de grâce: a chip-in eagle at the short par-4 16th, where a smart 3 iron off the tee had left him little more than 30 yards from the pin.  Poulter, meanwhile, played nearly flawless golf during a seven-birdie round of 66, save for an untimely bogey at the par-4 15th.  Nonetheless, the defending champion managed to hold solo second, one shot ahead of Graeme McDowell (whose own 66 might have been better had his putter not cooled down the stretch) and two up on Sergio Garcia, who closed with a Sunday-low round of 63………………Yuta Ikeda began his Japan Golf Tour career with a flourish, winning four times in both 2010 and ’11, and marking himself as one of the nation’s elite young stars.  But the 25-year-old fell noticeably from that perch during single-win 2011 and ’12 campaigns, and in 2013 had finished no better than a T5 at the Kansai Open - that is, until he broke through for a playoff victory over South Korean S.K. Ho to capture the Mynavi ABC Championship.  Ikeda – as well as 24-year-old Yoshinori Fujimoto – trailed the veteran Ho by one after 54 holes and, behind the combination of an early Ho stumble and four birdies of his own, opened up a four-shot lead through 11 holes on Sunday.  Ikeda would add birdies at the 13th and 15th, yet saw his lead shrink to two as Ho recorded four straight birdies at holes 12-15 – and then saw it dissolve altogether upon his bogeying both the 17th and the par-5 18th.  But having thus given away sure victory, Ikeda rallied immediately on the first playoff hole (the 525-yard 18th) by getting home in two and recording a two-putt birdie to nail down the victory………………Thirty-nine-year-old Tjaart van der Walt, a veteran of worldwide play, finally broke through for his first major tour victory at the Cape Town Open, closing with a one-under-par 71 to walk away by six shots.  Van der Walt began the final round with a two-stroke lead over 36-hole leader Hennie Otto, and Otto pulled briefly within one after birdieing the 3rd before collapsing with three bogeys over his next four holes.  At the same time, van der Walt carded birdies of his own at the 6th and the 9th to open a comfortable lead, then played the back nine in even par to enjoy a relatively stress-free finish.  Second place was taken by Michael Hollick, who closed with the day’s low round of 68 to finish on 280, while Otto hung on for third despite his closing 76.