Riding a nearly flawless final round 66, Bill Haas fought off a cadre of contenders looking for their first PGA Tour wins to claim the AT&T National by three strokes.  Playing over a long, hard Congressional Country Club layout, Haas began Sunday among a quartet of players tied for the lead, and he remained a part of the pack in the early going when he birdied the par-3 2nd, then bogeyed the par-4 5th.  But Haas turned up the heat through the course’s mid-section, rolling in a 10-foot birdie putt at the 8th, then following that with birdies at the par-5 9th and the watery par-3 10th to jump out to a lead he would never relinquish.  Second-place finisher Roberto Castro stayed close for a while, matching Haas’ fortunate birdie at the 14th (where Haas’ approach bounced off a mound onto the green) before falling three back when Haas added one final birdie at the par-5 16th.  Third place was shared by long-hitting Jason Kokrak and Korea’s D.H. Lee, the later closing with Sunday’s low round of 64 one day after been spotted on television making an obscene gesture towards a member of the gallery.  Two of Saturday’s 54-hole leaders, James Driscoll and Argentina’s Andres Romero, fell away early on Sunday, with Driscoll failing to card a birdie during a closing 74 and Romero making an early double-bogey at the 4th en route to a 75.  A flash of early excitement came from 19-year-old Jordan Spieth who began his round by holing out from a fairway bunker for eagle, then chipping in for a birdie at the 3rd to tie for the lead.  Spieth was able to make little happen thereafter, however, and eventually finished solo 6th……………England’s Paul Casey, once ranked as high as number three in the world, returned from a two-year, injury-related slump to score his first victory in 29 months at the Irish Open.  Exhiled from the winner’s circle since 2011’s early season Volvo Golf Champions in Bahrain, Casey began the weekend five shots out of the lead, and a Saturday 67 Carton House Golf Club layout only moved him a single shot closer.   But a second 67 would be in the offing on Sunday, with the up-and-down round initially highlighted by a run a five birdies between the 8th and the 13th holes that pushed Casey into the lead.  Ill-timed bogeys at the par-5 15th and the 462-yard 462-yard par-4 16th tightened things considerably, however, before Casey put an exclamation point on things by holing a 50-foot putt for eagle at the 513-yard 18th, to win by three.  Second place was shared by third-round leader Joost Luiten of the Netherlands (a recent winner at the Lyoness Open) and England’s Robert Rock, while Pablo Larrazabal, who stood second through 54 holes, faded to a disappointing 75 and solo fourth.  The victory was the 14th professional title for Casey, who injured his shoulder in a 2012 snowboarding accident and, after a lengthy layoff, has struggled to find his form since……………In an event perhaps more noteworthy for the exemptions it offers in the upcoming British Open than its place in the pantheon of Japanese golf, Australia’s Brendan Jones won for the 13th time on the Japan Tour at the Mizuno Open – securing for himself a spot at Murifield in the process.  The 38-year-old Jones, long a mainstay of the Japan circuit, began Sunday’s final round two strokes ahead of South Korea’s Kyung-Tae Kim and proceeded to card five birdies and an eagle, with three offsetting bogeys adding up to 68 and a three-shot triumph.  The victory also made Jones the all-time winningest foreigner in Japan Tour history, with over $8.5 million in the bank.  British Open exemptions also went to top-four finishers Kim, Makoto Inoue and veteran Shingo Katayama, as well as to the top two players in the seasonal Order of Merit not otherwise exempt, Satoshi Kodaira and another Korean, Hyung-Sung Kim.  Order of Merit leader Hideki Matsuyama, who had already made the British field via International Qualifying, missed the cut – his first MC since turning professional in April……………Just three weeks after claiming his maiden Sunshine Tour victory at the Vodacom Origins of Golf – Eastern Cape event, Jacques Blaauw closed with a sparkling 64 to add another Vodacom title to his résumé, this time the Vodacom Origins - Selborne Park.  Trailing 36-hole leader Merrick Bremner by three shots, Blaauw charged out of the gate with six front nine birdies to turn in 30, then tacked on additional birdies at the 12th and the 292-yard 18th (where he drove the green) to post a 198 aggregate.  Close on his heels to the end, Danie van Tonder and Brazilian veteran Adilson da Silva each closed with rounds of 66 to share second, one shot back.  Da Silva in particular gave a valiant chase, hitting a splendid second at the 18th from the base of a tree trunk to within 15 feet, but his putt to force a playoff lipped out.