Re: WTA Tier categories in 1999
The amount was $500,000 (from p 183) for a Tier II.
But as always this IS the WTA, organization of exceptions galore. Sydney results are listed on page 198, under Tier III and IV events, but was actually a Tier II! Prize money in 1999 at Sydney was $420,000 US.
Perhaps the Ausssie dollar was weak in these years? This wasn't the only year Sydney was an exception to the rankings table.