The 44-year-old golfer has spent a lot of time studying the course at Augusta National and always plays a few rounds before the competition begins.
He told Today’s Golfer magazine: “I think the bottom line is that it’s an awe-inspiring place and somewhere I like to be.
“The Masters is something I focus on and prepare for.
“It’s not just one week of the year, it’s about three months of preparation.
“I go to Augusta to play a couple of rounds before the Masters each year.
“I’ve collected a lot of good data during that time and I understand a lot of the pin placements. Augusta is about angles really…
“There are secrets, but at the end of the day, it’s about execution.
“Even if you know the shot to hit at Augusta, if you don’t hit it, you’re in trouble.”
Justin believes the course is one of the most tricky to play because of its “extreme slopes”.
He said: “I think [the greens] are tougher because of the slopes, for sure.
“We play surfaces as quick as Augusta maybe two or three times a year, but we don’t play them with such extreme slopes.
“Very close to the pins at Augusta you often have a very steep ridge, so if you miss on the wrong side, you literally can’t stop the ball running down that ridge.
“The severity of some of the sideboards – as I call those ridges – is what we don’t often see.”