Jordan Spieth is so excited about returning to Augusta National next week to defend his Masters championship that just thinking about it makes him feel like doing pushups. Spieth believes a strong showing in the Shell Houston Open, which starts Thursday, could have a significant impact on how well he plays in this season's first major championship. Although he didn't win - J. B. Holmes prevailed over Spieth and Johnson Wagner - he took plenty of confidence with him to Georgia. More...