By Tzvi Machlin Jordan Spieth is at the Valero Texas Open trying to defend his title ahead of the Masters next week. But he had a rough time putting that will put his momentum at stake. On the 6th hole at TPC San Antonio, Spieth found himself in a position to get par with just two feet to the hole. But his putt went left by, and his follow-up putt skirted in and out of the hole. Spieth was finally able to get the ball into the hole, but not before a brutal double-bogey. He dropped from minus-4 heading into the weekend to minus-2 – a drop from the top 12 to a tie for 46th. With the projected cu…