Dallas’ Scottie Scheffler, Jordan Spieth and Tom Kim are each in contention near the top of the leaderboard heading into Friday’s round.

The WM Phoenix Open is expected to attract more than 700,000 fans from around the world, and that means that security is tight in and around the area in Scottsdale.

Last year, the scene went too far, with 54 arrests as overcrowding marred the tournament. Organizers are aiming for the right balance, with a series of reforms aimed at maintaining the entertainment ...