The closest name would be Gary Wilkinson, but he's not so much a tennis commentator as an assistant host to Bruce McAvaney and Johanna Griggs. His function is to help guide the expert commentators, as the "voice of the public". He gets the experts to talk about things that he thinks the people at home would want to know about.
But as far as I know, Channel 7 didn't show much more than highlights of the Davenport vs. Tulyaganova match, so maybe it wasn't him. But if it was him, then you now know why he was probably bleeding on about the "sad demise of Commonwealth nations." Oh, but then also, Gary Wilkinson probably wouldn't give two rats asses about the British Davis Cup team. He's strictly an Aussie man. So it's probably not even him anyway. LOL.