ARDMORE, Pa. — A glance at the key hole Thursday in the U.S. Open.

HOLE: No. 13

YARDAGE: 102

PAR: 3

STROKE AVERAGE: 2.7

RANK: 18th

KEY FACT: Phil Mickelson made birdie on the short 13th to get to even par, and then played the rest of the way 3 under. Luke Donald also birdied the hole to top the leaderboard at 4 under before darkness suspended play. A total of 44 players made birdie on the par 3.