Marked for international stardom since winning back-to-back Asia-Pacific Amateurs (and their associated Masters exemptions) in 2010 and ’11, Japan’s Hideki Matsuyama went a long way towards validating those predictions by scoring his first PGA Tour win, a playoff triumph over Kevin Na at the Memorial Tournament.  It was a wild week at Muirfield Village, beginning with Rory McIlroy’s Thursday 63 (which included a double-bogey), a superb round which the streaking Northern Irishman promptly followed with a disastrous 78.  But the event’s real ups and downs were saved for the final nine on Sunday, when a host of big name contenders held or shared the lead, all to collapse near the close.  The  biggest crash came from Masters champion Bubba Watson, who seemed well on his way to his third win of the year before bogeying the short par-4 14th, then carding a double-bogey at the par 5 15th after hooking his tee shot miles out of bounds.  He could do no better than three pars thereafter, missing the playoff by a shot.  World number one Adam Scott also had his chances, grabbing a share of the lead through 11 holes before a watery double-bogey at the par-3 12th (and subsequent bogeys at holes 14-16) ended his hopes.  And then there was Matsuyama who, following Watson’s collapse, stood two ahead before promptly double-bogeying the 16th (with a water-bound tee shot) and bogeying the 17th.  Enter the 30-year-old Na, who’d teed off two hours before the leaders and carded an eight-under-par 64 to get in the clubhouse at 13-under-par 275.  Needing a birdie to tie him, Matsuyama stuffed his approach at the 18th inside six feet, holed the putt, then promptly won with an up-and-down par on the first playoff hole (the 18th) after Na pulled his drive left, into a creek……………Though not quite as impressive as 50-year-old two-time 2014 winner Miguel Angel Jimenez, 44-year-old Thongchai Jaidee continued his own measure of agelessness at the Nordea Masters, besting Victor Dubuisson and Stephen Gallacher on the first hole of sudden death to claim his sixth career European Tour title.  Following rounds of 69-70-68, Jaidiee trailed 54-hole leaders Henrik Stenson and Eddie Pepperell by four shots on Saturday night but wasted little time mounting a charge on Sunday, birdieing his first three holes en route to an outgoing 33, then adding an eagle at the 552-yard 11th and birdies at both the 14th and the par-3 15th on his way to a seven-under-par 65.  With both Stenson (71) and Pepperell (72) playing well enough only to linger on the periphery of contention, Jaidee was left to do battle primarily with Dubuisson and Gallacher, with the former having the best chance to win outright.  But having birdied five of his first 11 holes to get to 16 under par, Dubuisson could only manage pars over his final seven holes, eventually three-putting for par from just off the fringe at the par-5 18th.  Gallacher, meanwhile, stood four under on the day and 16 under overall through 16 holes, bogeyed the 209-yard 17th to fall back, then holed a 20-foot birdie putt at the last to fight his way into the playoff.  But the extra session would be short-lived as Jaidee managed to birdie the 18th while Dubuisson and Gallacher could only manage pars, and just that quickly it was over……………In an event which, in recent years, has become as noteworthy for the British Open berths it awards as for the intrinsic value of its title, South Korea’s Dong-Kyu Jang claimed both with a three-shot victory at the Mizuno Open.  The 25-year-old Jang stood two shots off the halfway lead following rounds of 70-67, then jumped into a two-shot 54-hole lead of his own following a third round 67.  With four Open Championship spots up for grabs, winning was not an absolute necessity, but Jang went out in 33 before being slowed by bogeys at the par-5 11th and the 13th.  But with his lead now trimmed to one, Jang rallied to birdie both the 17th and 18th to pull away at the wire.  His closest third round pursuer, Juvic Pagunsan of the Philippines, closed with a 70 to nail down the second Open slot, while a pair of players who mounted strong Sunday charges, South Korea’s Hyung-Tae Kim (66) and Japan’s Tomohiro Kondo (67) tied for third to claim the final two berths.  Also gaining places in the Royal Liverpool field were Japan’s Yusaku Miyazato and South Korea’s Hyung-Sung Kim, who stood first and second in the Japan Tour Order of Merit after the completion of play.