Despite still feeling the effects of a back/neck injury dating to the summer of 2013, Louis Oosthuizen managed the rare feat of winning his first event of the new year four the fourth consecutive season, successfully defending his title at the Volvo Golf Champions in Durban, South Africa.  Following a disappointing third round 71 that was marred by a triple-bogey at the 417-yard 16th, Oosthuizen began Sunday two behind 54-hole leader Tommy Fleetwood and initially made little headway before an eagle at the par-5 8th moved him briefly into the lead.  The 2010 British Open champion played uneven golf thereafter, however, bogeying the par-5 10th, birdieing both the 13th and 14th, then making a crucial bogey at the 16th to fall one behind countryman Branden Grace, who’d birdied both the 16th and the 273-yard par-4 18th en route to a closing 68, and the lead.  But rather then wait for the driveable 18th and a chance to tie, Oosthuizen proceeded to stick his approach to two feet at the tumbling 401-yard 17th to draw even, then clinched the title by chipping to a similar distance to birdie the last.  Grace, who was looking for his first win since 2012, took solo second, while England’s Fleetwood (who closed with a disappointing 72) and Joost Luiten of The Netherlands (71) shared third, two shots off the pace.  Oosthuizen’s triumph represented the eighth time in the E Tour’s last 11 events on South African soil that a homestanding player won, and the seventh straight E Tour visit to Durban to produce a native winner…………………It took Jimmy Walker seven years to land his first PGA Tour victory at the 2013 Frys.com Open but only three months to claim his second, as he tore through the field with a closing 63 to win the Sony Open in Hawaii, in Honolulu.  Walker began the day two strokes behind 54-hole leader Chris Kirk and on a day when scoring was predictably low at the Waialae Country Club, did little more than stay in the mix after carding three birdies in his first 10 holes.  But following another birdie at the par-4 13th and a clutch up-and-down for par at the 14th, Walker then poured in three straight birdies to seemingly take command, gaining the lead when Harris English made bogey at the 15th, then stretching it to three with additional birdies at the 16th (from seven feet) and the seaside par-3 17th (from six feet).  A birdie at the par-5 finisher would have salted away the victory but when Walker could do no better than five, he had to look on nervously as Kirk made a late charge, birdieing the 17th and leaving himself a makeable 30-foot eagle chip at the last that would have forced a playoff.  But Kirk missed, leaving him alone in second place and Walker as the champion.