user: Question: Which visitors have a leading scorer of Roy : 25
Columns: ['#', 'Date', 'Visitor', 'Score', 'Home', 'Leading scorer', 'Attendance', 'Record', 'Streak']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [32.0, 'January 2', 'Portland Trail Blazers', 'W 90–79', 'Minnesota Timberwolves', 'Jefferson : 29', 'Target Center 13,339', '19–13', 'W1']
SQL:

assistant: SELECT "Visitor" FROM "Table" WHERE "Leading scorer" = 'Roy : 25';