"When you hit the shots, it seems very simple," McIlroy said. "I had a lot of good shots out there, lot of iron shots that were 12, 15 feet away from the pin and I got myself a lot of looks for birdies. I adopted maybe more of a conservative strategy off the tee this year. But once you put your ball in the fairway that means you can be more aggressive into the greens. So it sort of balances itself out."
The Stadium Course has rarely looked so vulnerable with barely a trace of wind and some pins in bowls that allowed for good looks at birdie. Half the 72 players in the morning broke par.
But the punishment is never far away, as Scott Stallings discovered. He opened with five straight birdies to get everyone's attention, but after going out in 31, Stallings gave most of it back with a bogey, double bogey and a triple bogey on the 16th when he hit two balls into the water. He shot 40 on the back for a 71.
"It just goes to show about the golf course and really how volatile it is," Stallings said.
Castro hasn't discovered that yet. This was a day when everything went right.
He made three birdies early in his round on the back until making his tap-in birdies on the 17th and 18th. Then, he hit 3-iron into 3 feet on the par-5 second hole for an eagle and was 7-under through 11 holes. On the fourth, he hit his approach inside 2 feet for another birdie, and then he hit wedge to 18 inches on the sixth.
Castro had a birdie putt just outside 12 feet to break the course record, but missed it.
After his eagle on the second hole — his 11th of the round — Castro was reminded of a game he plays to try to birdie every other hole.