user: Question: Who were the previous champions from the event won on May 1, 2010?
Columns: ['Championship', 'Current champion(s)', 'Previous champion(s)', 'Date won', 'Location']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['NECW Heavyweight Champion', 'Sean Burke', 'Antonio Thomas', 'October 4, 2013', 'Beverly, MA']
SQL:

assistant: SELECT "Previous champion(s)" FROM "Table" WHERE "Date won" = 'May 1, 2010';