While he may be just 21 years old, Jordan Spieth is not exactly inexperienced.

Even at the Masters — where on Sunday he'll attempt to hold on to a four-shot lead and win his first major championship — he knows what it's like to hold a lead with 18 holes to go. Last year he was tied for the lead with Bubba Watson after three rounds, and he eventually finished second.

Even off the course, he seems to be making veteran moves.

According to Brian Wacker of PGATour.com, Spieth rented two houses at Augusta for Masters week, and he uses one of them as his personal sanctuary.

From Wacker:

One is for sleeping. The place he can rest, gather his thoughts, find some quiet time if necessary.

The other is for fun. The place he can hang out in and enjoy time with his parents, brother, friends and anyone else in town from Dallas this week.

If he walks into the latter and golf is on television, someone immediately changes the channel. It doesn’t matter if it's turned to lawn darts or HGTV. Anything but golf.

In 2012, Augusta.com reported that a four-bedroom house rented for $8,500 on average for Masters week, with prices overall ranging from $2,500 (for a condo) to $25,000 (for a 10-bedroom house).

We have seen players with big leads on Sunday at the Masters crack before. In 2011, another 21-year-old, Rory McIlroy, took a four-shot lead into the final round and ended up 10 shots behind the winner, Charl Schwartzel.