Agree 100%. What about interviews outside tennis? Like ATP events, charities, etc. would you think that having a good command of the english language will help promote the game even more?
Firstly, Rafa has millions of fans and the base covers probably every nationality on this planet. Roger was here first so naturally he already had a huge fan base. Speaking better English would what? Get Rafa more fans in America, UK, Australia? I hardly feel that's a priority for any tennis player.
Secondly, speak better English to be "an ambassador" I disagree. In the end, actions speak louder than words, especially in today's world of media mass manipulation. Fed's crying and racquet smash are far more of a subliminal advertising than anything he's ever said. Just as Rafa's vamos and fist pump are.
Charities & Events. Rafa did a charity event in our country with wheelchair players. He's been in hospitals, plays with kids, has his foundation in Spain what other charity event should he do with his lack of time and already overloaded schedule? If he gave up tennis and wanted to participate in these outside of Spain then sure, he would probably take the time to gain better command of English.
ATP Events? Like the Dubai opening party or a council conference call? The latter isn't a promotion. The former is a social chit chat where one doesn't need command of a language. As for general promotion there are also 9 other top ten players.
Sampras and Federer dominated the game for ages, an American and a Swiss (who needs to speak extra languages due to country size) so maybe we're used to having someone "English" promote the game. If we go back to Borg and Lendl, did they speak a lot of English, were they heavily involved in the publicity of it all?
I don't see tennis as an English game at all. If it were only English players then yes. That many tennis millionaires have houses in the States where it's warmer than their home country, it's obvious they would be exposed to the language daily & thus gain better command. Nadal has a warm country he won't do that, although I heard something about the Caribbean on this board.
So what about speaking better English for ATP events to promote the game? Personally, I think Rafa has done so much for the publicity of tennis in the last few years he doesn't need to do more. Look at the lovely condolence speech he gave to Roger when he won the AO. On the spot, no preparation and it was very heartfelt sympathy to his greatest rival.
People who improve their English do so, because they need to. If you can get by just fine for what you need, and there are other important goals to reach, then improving language skills would not be a priority. I would love to add Spanish to my language skills, but I don't, because I don't need it. I can get by being bilingual in 2, and moderate in one other.