"Fifth major" on the PGA Tour?

Question

Which event on the PGA Tour is unofficially referred to as the fifth major?

Answer 1

The Players Championship at Ponte Vedra Beach, Florida is described as the fifth major, though it does not have major status - it's nonetheless a big draw on the tournament calendar, thanks in part because it offers the highest prize fund of any tournament in golf ($8 million 2004–06, $9 million in 2007, $9.5 million in 2008).