user: Question: Loss of Wilcox, and a Date of Jun 18 had what opponent?
Columns: ['Date', 'Opponent', 'Score', 'Loss', 'Crowd', 'Record']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Jun 1', 'BAL', 'W 14-2', 'McGregor', '47,252', '38-9']
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Loss" = 'Wilcox' AND "Date" = 'Jun 18';