In the PGA Tour’s final tune-up before The Masters, long-hitting J.B. Holmes claimed his fourth career victory at the Shell Houston Open, but not before enduring a two-hole, three-man playoff to do it.  After opening with rounds of 65-70-73, Holmes actually began Sunday’s finale six shots behind the red-hot Jordan Spieth, who himself arrived in Houston coming off a victory in Florida and a runner-up in San Antonio.  But after rounds of 69-66-67 gave Spieth a one-shot 54-hole lead, he was unable to get moving on Sunday, playing his first 12 holes even par – and largely being blown aside by Holmes, who opened the day with five straight birdies before turning in 29, then added birdies at the 11th and 12th to move three ahead of the field.  But with 59 looking possible, Holmes failed to birdie either back nine par 5, then bogeyed the par-3 16th to eventually finish one shot off the course record with a 64.  Spieth, meanwhile, drew even with back-to-back birdies at the 13th and 14th, then could find no more magic coming home, posting a 70 to join Holmes on 16 under par.  But in a game where form can be notoriously fickle, the playoff’s third competitor, Johnson Wagner, was a real surprise as he entered the week without a top-50 finish in 2015, and only seven days removed from shooting an opening 87 at the Texas Open.  But with rounds of 69-68-66, Wagner hung around all week, eventually birdieing the demanding 72nd hole to join the playoff.  Spieth eliminated himself by bogeying the first extra hole, and when Wagner missed a short par putt at the second, Holmes was left with an easy tap-in for the victory.