Federer tried. He played worse! Case closed! Oh, and please show me where I ever said NO ONE can improve with a more modern spec. I've ONLY ever discussed Federer! And the reason is because he's used the 90 for over 10 years and used the 85 for 10 years before that! A 98 is something that's completely foreign to him. Please show me where I said that Nadal would improve if he switched to a 90 or 85 or where I said that an 80 year-old wouldn't improve switching to a granny stick. I'm waiting.