The St. Petersburg WCT was a men's tennis tournament founded in 1953 as the Masters Invitational in St Augustine, Florida.
The women's tournament continued under various brand names and various locations in the Tampa Bay Area until it was discontinued in 1990.
The event was part of the WCT Tour and was played on outdoor hard courts.
In 1959 it changed location to St Petersburg, Florida, where it remained under that brand name until 1965.
The tournament was part Florida-Caribbean Circuit which was a major feature of the international tennis scene in the 1960s and early 1970s.