Looking at the rankings and the number of points Roger and Rafa have to defend this year, I'd say it's unlikely that Federer can regain it by the end of the season.
His best chance will probably come during next year's clay court season where he doesn't defend much and Nadal defends everything. Whether his game will be up to the level recquired to do it at almost 30 years old is anyone's guess, though.
His best chance will probably come during next year's clay court season where he doesn't defend much and Nadal defends everything. Whether his game will be up to the level recquired to do it at almost 30 years old is anyone's guess, though.