Thanks swish, but yes, that is the youtube video of the opening that although complete, is of tinny, low quality audio. The quality of the closing theme is much better, but that ones not complete. I do have a complete hi-qual recording of the closing theme though.
I think my only chance is to see if I can download a good quality NBC wimbledon broadcast from the last 20 years that contains the intro and rip audio from it. I'm currently downloading the 2011 final NBC broadcast from another torrent site, its possible the theme may be on there, but NBC had a quirky habit of NOT playing the theme during the broadcasts of the finals. We'll see though, I'm still trying to get an invite to tennishaven, if any vids are available that would contain the theme, it would be one of those.