Nineteen-year-old Jordan Spieth made history at the John Deere Classic, becoming the youngest winner of a PGA Tour-recognized event in 82 years when he prevailed in a five-hole playoff with defending champion Zach Johnson and David Hearn.  Spieth, a former two-time USGA Junior Boys champion who first began playing in PGA Tour events at age 16, fought his way into the playoff by carding birdies on five of the last six holes, punctuated by a holed 44-foot bunker shot at the par-4 18th that Spieth called “the luckiest shot I ever hit in my life.”  That helped the former University of Texas All-American to card his third consecutive 65 at the TPC Deere Run and to make up a six-shot 54-hole deficit, though his cause was aided significantly when Johnson – who led for much of the back nine – made bogey at the 72nd to open the door to a playoff.  In the short term, the victory gives Spieth full membership on the PGA Tour (he began the year playing on sponsor exemptions) and also earned him the final spot in next week’s Open Championship at Muirfield.  In the bigger picture, Spieth became the youngest winner since Ralph Guldahl claimed the Santa Momnica Open in 1931, and the fourth youngest winner overall in PGA Tour history…………………Bouncing back from his disappointment at the U.S. Open (as well as an MC at last week’s Greenbrier Classic), Phil Mickelson announced his readiness to contend at the upcoming Open Championship by winning for the first time on a links course at the Aberdeen Asset Management Scottish Open.  He did so, however, with rather more drama than he might have intended, for having come all the way back from a five-stroke 54-hole deficit to take a one-stroke 71st-hole lead, Mickelson promptly three-putted from 15 feet, allowing South African Branden Grace to join him in a playoff.  But after Grace’s third to the 18th checked up 25 feet shy of the hole, Mickelson lobbed an American-style wedge past the pin and spun it back to six inches, with the ensuing tap-in clinching the title.  The victory was his 48th worldwide but his first in Europe since claiming the Tournoi Perrier Paris – a Challenge Tour event – way back in 1993.  For Grace, a four-time E Tour winner in 2012, the runner-up finish was his best finish thus far in 2013, and his best at stroke play since opening his campaign back in January with three straight top 10s in South Africa and the Middle East.  Third-round leader Henrik Stenson, whose middle rounds of 64-66 stood him two strokes ahead on Saturday night, stayed in contention through 13 holes Sunday before three late bogeys dropped him into a tie for third with 22-year-old Dane J.B. Hansen.