Defense lawyers in the Madison Square Garden sex harassment case plan to call a bombshell "secret" witness in a bid to show fired Knicks exec Anucha Browne Sanders has a history of claiming men hit on her.

While working in sales at IBM, Garden lawyers say, Browne Sanders and other women complained to bosses that the son of a high-powered company exec made "sexually inappropriate" comments to them.

The defense team has subpoenaed IBM records to find out more about the allegations, which they learned about only after Browne Sanders filed her blockbuster $10 million suit against coach Isiah Thomas and Garden Chairman James Dolan, sources say.