With his second win in as many starts, Tiger Woods returned to number one in the Official World Ranking for the first time since October, 2010 by claiming the rain-delayed Arnold Palmer Invitational, edging Justin Rose by two.  Woods initially thrust himself into the picture on Friday when he pulled within one of then-leader Justin Rose through 15 holes, only to finish with three straight bogeys to tumble back into the crowd.  But a third-round 66 (keyed by an eagle at Bay Hill Lodge & Club's short par-5 16th) pushed him to a two-shot 54-hole lead - a lead he would essentially have to sleep on twice after Sunday rains wiped out play with the leaders having completed two holes.  But Woods added two quick birdies on Monday morning and was never seriously pressured thereafter.  Rickie Fowler pulled within two with a birdie at the 14th before burying himself with a triple-bogey eight at the 16th, leaving Justin Rose to claim solo second, three shots ahead of Fowler, Keegan Bradley, Mark Wilson and Spain's Gonzalo Fernandez-Castano.  The victory, Woods' 77th on the PGA Tour, also tied Sam Snead's 48-year-old record by winning the event for the eighth time, a feat accomplished by Snead at the Greater Greensboro Open between 1935-1968.  Woods cited improved health as a key factor in his three early 2013 wins, sparking considerable talk of his game now being back near the level it occupied before injuries, scandal and swing problems derailed his career...............In an event shortened to 54 holes by multiple rain interruptions, Thailand's Kiradech Aphibarnrat claimed his first career European Tour victory by carding a final-round two-under-par 70 to win the Maybank Malaysian Open.  The 23-year-old Aphibarnrat had to work hard for his money on Sunday, beginning the round one stroke ahead of 2011 Masters champion Charl Schwartzel and ultimately being challenged by ex-Ryder Cupper Edoardo Molinari and three-time Major champion Padraig Harrington before emerging victorious. A birdie at the third and an eagle at the fifth extended his lead, but Aphibarnrat then gave the competition an opening by bogeying the seventh and 12th.  In the meantime, Molinari, who had struggled since returning from 2012 wrist surgery, closed with a 67 to post 204 and take the lead in the clubhouse, and Harrington went out in 31, launching himself into the fray.  Aphibarnrat pulled ahead of Molinari with a birdie at the 14th before a two-hour rain delay dragged play to a halt, but a birdie at the 16th as action resumed, combined with Harrington coming home in 39, ultimately sealed the victory.  Denmark’s Anders Hansen tied for Sunday’s low round (66) en route to claiming solo third while young Frenchman Victor Dubuisson tied for fourth with Schwartzel (who closed with a disappointing 71) three shots off the pace.  For Aphibarnrat, previously a winner of the Asian Tour’s 2011 SAIL Open, the victory earns him full-time status on the European Tour, as well as a jump to 85th in the OWR...............And the beat rolled on for Jaco Van Zyl, who needed a playoff but ultimately won for the third time in his last four South African starts, claiming the inuagural 30-player Investec Cup on the first hole of sudden death versus Hennie Otto.  For most of Sunday the main story was the veteran Otto, who began play six shots behind the front-running Van Zyl before carding a bogey-free 10-under-par 62 to take the lead, requiring Van Zyl to birdie the par-5 18th just to tie.  Playing the 18th once more, Van Zyl dumped his second in the water but scrambled for par; Otto pulled his approach left and chipped poorly, his bogey handing Van Zyl both the title and an additional R2 million for winning the event's season-long bonus pool.    Justin Walters, who closed with 67, took solo third, two shots out of the playoff.  The event was limited to players qualified (via accumulated poibts since last October) and utilized three sites, with the final 36 holes played at the Lost City Golf Club.