SEA ISLAND, 26 Oct, 2014 (AFP) - The 27-year-old American defeated Zimbabwe's Brendon de Jonge and Will MacKenzie, of the US, in the $5.6 million event at the Seaside Course at Sea Island Resort.
Streb posted the low round of the day making birdie on four straight holes on the back nine for a seven-under 63. He got in first at 14-under-par 266. De Jonge carded a five-under 65, while MacKenzie shot two-under 68 to join Streb at 14-under.
They returned to the 18th hole for the playoff. MacKenzie found a greenside bunker with his approach before Streb and de Jonge hit the green with their second shots.
MacKenzie's par putt missed and after Streb and de Jonge two-putted for their pars, MacKenzie was knocked out.
On the second playoff hole, de Jonge hit his tee shot at the par-three 17th to about 20 feet. Streb then landed his tee ball within four feet. De Jonge's birdie try rolled past the edge.
Streb drained his birdie putt for his first US Tour win.
Last year's winner Chris Kirk carded a three-under 67 to move into a share of fourth place at 12-under. He was joined there by Ken Duke (66), Kevin Kisner (65) and Russell Henley (69).
Mark Wilson (67), Argentina's Fabian Gomez (68), Andrew Svoboda (71) and Kevin Chappell (65) tied for eighth place at 11-under-par 260.
Leading scores after Sunday's final round of the USPGA Tour's The McGladrey Classic (USA unless noted, par-70, x-won in a playoff):
266 - x-Robert Streb 69-66-68-63, Will MacKenzie 65-68-65-68, Brendon de Jonge (ZIM) 68-64-69-65
268 - Ken Duke 67-69-66-66, Kevin Kisner 69-68-66-65, Chris Kirk 68-67-66-67, Russell Henley 68-63-68-69
269 - Mark Wilson 67-66-69-67, Fabian Gomez (ARG) 67-66-68-68, Andrew Svoboda 66-66-66-71, Kevin Chappell 67-67-70-65
270 - Andrew D. Putnam 68-67-66-69, Hudson Swafford 70-67-66-67
271 - David Toms 73-66-67-65, Tony Finau 71-67-67-66, David Lingmerth (SWE) 68-67-70-66
272 - Carl Pettersson (SWE) 68-67-69-68, Scott Piercy 67-67-68-70, Sean O'Hair 69-71-64-68, James Hahn 71-69-65-67, Ben Martin 70-68-65-69