A look at the key hole Thursday in the first round of the Masters:
STROKE AVERAGE: 5.215
KEY FACT: Traditionally the easiest hole on the course, No. 15 caused plenty of problems in the opening round. Especially for 2015 champion Jordan Spieth, who dumped a ball in the water on the way to making a quadruple-bogey that left him with a 3-over 75 — the worst score of his three-year Masters career.