Watching Chanda Rubin doing on court interviews at the AO. I went back and watched her 2002 Us Open 4th Round with Venus.
What is her actual racket? The pj she used from 2002-2004 were I.S6 and I.x6 .. both US Open matches she lost to Venus.
I counted her string patterns in her 2000 USO against Seles and in both matches against Venus and it's 18x20 (by my eyes). The Ti.S2 is 18x19
The only Ti racket I found in a simple google search that was 18x20 was the Ti.Radical or the i.Radical. And I know that's not it because the throat on her racquet is a very large, very wide. It looks nothing like the smaller radical throat.
Maybe we'll never know. It's just such a unique looking racket whatever it was she was hitting with. Looks like it would be kind of difficult to swing in the way I think the Ti.S6 looks difficult to swing (but we know how lite it is)
This link said she played with the i.x6 at the 2003 AO
racket, racquet, string, tension, synthetic, gut, polyester
nkelsey.x10.mx