Enduring a three-hour final-nine rain delay during which he held a precarious one-stroke lead, D.A. Points returned to make four closing pars – the last via a clutch 13-foot putt – to claim his second career PGA Tour victory at the Shell Houston Open.  Using a putter he long ago borrowed from his mother, Points was the tournament’s opening-round leader with a 64, then slipped somewhat with back-to-back rounds of 71 before rallying for the closing 66 that ultimately carried him home.  His final birdie came at the par-5 13th where a chip destined to roll well by struck the pin, leaving a tap-in, and Points had to get up-and-down at both the 17th and the 18th in order to hold on for victory.  Aced out of a playoff by Points’ final putt were Sweden’s Henrik Stenson (who closed with a 66 to record his second straight PGA Tour top 10 finish and, more importantly, secure a spot in The Masters by ending the week among the top 50 of the OWR) and American Billy Horschel, who cashed what was by far the largest paycheck of his career.  For Points, the win represents a major turnaround in a season that began with seven missed cuts in nine starts, and was his first since claiming the 2011 AT&T Pebble Beach Pro-Am, with actor Bill Murray as his pro-am partner.  Twenty players were clumped within four shots of the lead when Sunday began, and several big names made runs at the lead.  Dustin Johnson actually surged in front early in the afternoon before a bogey at the 12th derailed him, though his closing 65 was good enough to tie for fourth with Ben Crane, whose final-round 64 was the day’s lowest.  Phil Mickelson (T16), Kevin Chappell (T6) and long-hitting Jason Kokrak (9th) also got within shouting distance before all eventually falling back, while Monday Qualifier and 36-hole leader Steve Wheatcroft closed 72-74, ultimately tying for 22nd...............It was a day of great jubilation and great disappointment for Germany's Marcel Siem.  The first, second and third round leader of Morocco's Trophee Hassan II, the ponytailed 32-year-old Siem entered the final round riding a four-shot margin and with the potential to earn a ticket to The Masters were he to hold on for the victory.  Two-time E Tour winner Mikko Ilonen of Finland proved Siem's greatest challenger, actually catching him in the early going after making birdies at the second, third and fourth.  But Siem responded with birdies at the fifth and seventh, pulled further ahead when Ilonen bogeyed the par-5 10th and pretty much salted it away when the Fin logged an untimely double-bogey at the 211-yard 12th.  Indeed, only two late Ilonen birdies combined with Siem's bogey at the last allowed the winning margin to close to three strokes, with England's David Horsey joining Ilonen in second.  Such was Siem's jubilation.  The disappointment came in the hours to follow when Henrik Stenson tied for second at the Shell Houston Open, leaping to 43rd in the OWR and bumping Siem agonizingly to 51st - one place shy of the coveted Masters invitation.  The win was Siem's third career title on the European Tour, and he readily copped to placing a Saturday night phone call to his nation's greatest-ever golfer, Bernhard Langer, to ask for advice on how best to handle a four-shot lead...............Firing a dazzling eight-under-par final-round 64, Australian veteran Scott Hend won the inaugural Chiangmai Golf Classic in Chiangmai, Thailand, cruising home ahead of South African rookie Bryce Easton by three.  The victory was the 40-year-old Hend’s third career Asian Tour triumph and was largely made possible by the Sunday collapse of Thai star Prayad Marksaeng, who built a commanding five-stroke 54-hole lead with rounds of 65-67-66 before crashing to a closing 74, leaving him alone in third.  The 25-year-old Easton, playing in his first Asian Tour event, matched Hend’s closing 64 but had began the day too far back after a Saturday 72 had slowed his progress.  Up-and-coming 23-year-old Chinese prospect Mu Hu was also a factor, logging his first Asian Tour top-five finish after closing with 68, good for solo fourth.  The event drew a strong field given both its newness and its place on the schedule, with Hall-of-Famer Ernie Els (T14) and 2009 PGA Champion Y.E. Yang (T20) heading up a strong list of international entries...............With the Japan Tour breaking new ground by playing its second consecutive season-opening event on foreign soil, 39-year-old South Korean Ho-Sung Choi survived a long Sunday rain delay to emerge victorious in the Indonesia PGA Championship, edging countryman Young-Han Song, Japanese veteran Kaname Yokoo and Juvic Pagunsan of the Philippines by two.  Despite being a longtime professional, Choi, a regular on the Korean domestic tour, had never played a Japan Tour event prior to the season-opening Thailand Open, where he withdrew after an opening-round 73.  But in Jakarta, after trailing 36-hole leader Song on Friday evening, he closed with rounds of 65-67 (the jumpstarted by an opening eagle) to claim the trophy.  Japan Tour regulars Hideto Tanihara and Toshinori Muto shared fifth place on 272, while the group on 273 included notables Thaworn Wiratchant of Thailand, Wen-Chon Liang of China and homestanding star Yuta Ikeda.