A suspicious backpack left at the front entrance of the Tennis Center at Crandon Park led to a lockdown on the Sony Open grounds while police investigated.
Miami-Dade Police, who had dispatched a bomb squad, deemed the bag safe at around 9:30 p.m., giving the all-clear to anxious fans.
Pedestrians were not allowed to enter or leave the area during the hour-long lockdown, and cars were prohibited from driving past, causing a huge traffic snarl on Key Biscayne.
That upset dozens of ticket-holders who were milling outside the entrance trying to get in.
“They’re not suspending play, but they’re not letting us in,” said Jamie Isicoff, of Miami. “I don’t think that’s fair. We’re stuck here behind three rows of caution tape and they’re telling us that there’s no refund.”
Meanwhile, fans at Stadium Court were oblivious, as they cheered top-ranked Serena Williams on to a 6-2, 6-2 win over Angelique Kerber. Rafael Nadal and Fabio Fognini played the late evening match.
Miami Herald editor Patricia Andrews contributed to this report.