In an event which at times felt like a Major championship, with more big-name contenders falling away down the stretch than mounting a charge, 33-year-old James Hahn broke through for his first PGA Tour victory by winning a three-man playoff at the Northern Trust Open.  Though the field was the event's lightest in recent memory, there was plenty of star power on the leaderboard throughout the week, with the first three rounds belonging to 47-year-old Retief Goosen who, now fully recovered from 2012 back surgery, looked like a possible wire-to-wire winner with rounds of 66-74-69.  But a Sunday 75 would derail Goosen, leaving Riviera's firm-green, kikuyu-rough stage to a range of stars who fired but, in the end, mostly fell back.  There was Jordan Spieth who, standing on six under par but believing he'd need to reach seven, ran an aggressive chip past the hole at the 72nd, missed the comebacker and finished on minus five.  Then there was Sergio Garcia, who stood seven under par on the tee of the par-5 17th before posting back-ro-back bogeys to also stagger home on minus five.  Dustin Johnson also bogeyed the 17th, then missed an 11-foot birdie putt at the last that would have moved him to minus seven.  But Johnson instead found himself tied on minus six with Hahn and England's Paul Casey (who also bogeyed the 18th while closingh with 68), leading to a three-hole playoff.  Casey would bow out at the second after parring the 315-yard 10th, before Hahn closed out Johnson by rolling home a clutch 20-footer for his second straight birdie, this time at the par-3 14th..................Having played his way onto the European Tour via November's Q School, India's Anirban Lahiri became a two-time 2015 winner by claiming his native Indian Open in the event's first-ever playing as a co-sanctioned E Tour event.  It helped, of course, that the tournament was played at the Delhi Golf Club, a familiar track upon which Lahiri had previously logged Asian Tour victories in 2011, 2012 and 2013 - though past successes seemed to matter little when the 27-year-old opened with a disappointing 73, leaving him fully eight shots off the first round lead.  A second round 65 got Lahiri pointed back in the right direction, though he still trailed countryman S.S.P. Chowrasia by six shots after the diminutive Chowrasia opened with rounds of 65-67.  Chowrasia, for his part, would add a Saturday 69, good enough to give him a two-shot 54-hole lead over Siddikur Rahman, a five-shot margin over his next closest pursuer (Australian Marcus Fraser) and a seven-shot cushion over Lahiri, whose third round 70 was slowed by a double-bogey the 386-yard 13th.  For Chowrasia, Sunday began poorly, with two bogeys and double-bogey (at the 418-yard 4th) in his first seven holes.  Three more back nine bogeys would eventually see him home in 76, yet despite this collapse, he might well have won the tournament in regulation but for Lahiri's chipping in for par at the 171-yard 17th.  Lahiri couldn't capitalize on his scrambling three by birdieing the 545-yard 18th, however, leaving him deadlocked with Chowrasia on seven-under-par 284.  The playoff began at the 18th and after Chowrasia hooked his drive into the jungle, Lahiri made birdie to clinch the title..................Twenty-five-year-old Branden Grace won five times worldwide during his breakout 2012 season, and with three victories before the end of February, he appears on pace to better that number in 2015.  Having already claimed European Tour wins in South Africa and Qatar, he began the final round of the Dimension Data Pro-Am four shots behind 54-hole leader Darren Fichardt, then deepened his predicament by double-bogeying the 419-yard opener at the Fancourt Resort's Montagu course to fall nearly out of site.  But on a windy afternoon that made scoring difficult, Grace buckled down thereafter, birdieing the 6th and 9th to turn in 36, then, following a bogey at the 354-yard 11th, charged home with birdies at the 12th, 14th and 16th to card a two-under-par 70.  With Fichardt stumbling around in 75, Keith Horne was left as Grace's primary pursuer, but Horne couldn't find another birdie after the par-4 16th, and would ultimately finish second, two back..................Having suffered a heartbreaking loss in this same event one year earlier (finishing second after Tony Summers holed a pitching wedge from the woods to eagle the 70th), 28-year-old Ryan Fox used some fireworks of his own to win the 2015 Queensland PGA Championship, edging Cameron Smith and Matthew Millar by a shot.  Fox began the final round four strokes behind 54-hole-leader Millar and made only limited headway upon playing the City Golf Club's par-33 front nine in 31 on Sunday.  Two more birdies at the 10th and 12th made him relevant for the homestretch before lightning struck not once but twice, first when Fox eagled the par-4 16th upon driving within eight feet, then when he backed this up by holing a 25-foot putt for a second straight eagle at the 490-metre 17th.  A par at the 406-yard closer then proved just enough to edge Smith (who birdied three of his last four and shot 63) and Millar (who closed with 65) by one.