Golf-Sizzling Spieth back on track in bid for third major

By Mark Lamport-Stokes

KOHLER, Wisconsin, Aug 15 (Reuters) - Jordan Spieth caught fire with an electrifying back nine charge in the PGA Championship third round on Saturday and reignited his bid for a rare third major victory this year.

Five strokes off the pace after the second round at a sun-baked Whistling Straits, the Masters and U.S. Open champion fired a bogey-free seven-under-par 65 to vault within two strokes of Australian leader Jason Day.

Spieth stormed home with six birdies in the final eight holes to move into second place at 13-under 203 and earn a spot in the final pairing with Day on Sunday.

"On the back nine it was nice to get in the zone," world number two Spieth told reporters…