Casey Johnston expressed hesitation about backing Rory McIlroy for a top-10 finish this week at the Texas Children's Houston Open, despite Rory's form. Johnston noted that Rory has historically experimented with various preparation strategies for the Masters and, despite recently winning at TPC Sawgrass and Pebble Beach, has failed to convert similar success into Augusta victories. Johnston speculated Rory might treat this week as more about testing and fine-tuning for Augusta than a must-win scenario, making a top-10 bet risky. He specifically pointed out, even a top-15 finish could still satisfy Rory's goals, rendering the -105 top-10 market less appealing.