Annacone called it in 2011

https://www.theaustralian.com.au/sport/roger-federers-coach-paul-annacone-says-20-grand-slam-titles-not-beyond-star-charge/news-story/e4960e702e50dfa72b64179db1542d56

Interesting piece !

Called it perfectly though I suspect he might not have been the only one to talk of 20 Slams. Back then it always seemed little more than fanciful speculation ....... just how many people, I wonder, actually gave it any real credibility ..... ?? Cannot honestly say I did.

The article also mentions that it was about this time (2011) when Fed took the first steps of a significant change in strategy, to become a more aggressive, more offensive player.

I guess most remarkable of all is that the closing sentence resonates as clearly today, seven years on, as it did back in 2011 :

"One of the most amazing things about Roger is that he so loves it, still, and it's not a grind to go play smaller tournaments. It's not a grind to train. I mean, he loves it. The energy level's incredible," he said.

That piece was written before AO 2011 and hence before the reign of Djokovic.  

At the time of writing Djokovic had been in three grand slam finals USO 2007 (lost), AO 2008 (won), USO 2010 (lost).  

Following that article up to the beginning of 2017 Djokovic then appeared in 18 slam finals, winning 11 of them.  So Annacone made his predictions not realising that mens tennis was on a cusp of a new era - the era of Djokovic.  

However, what surely must have surprised Annacone was that Federer would out last his rivals (except a stuttering Nadal) to reap the rewards a full six years later (from 2017 onwards) and be able to beat the next two younger generations of tennis players.

Bet Annacone didn't envisage Fed going 4.5 years without winning a Slam and STILL getting to 20.

I'm not sure if Annacone was really of his own acccord making a prediction here or whether a journalist said "can he win 20?" and then Annacone's response was like "oh, whatever, could be". It's hard to say from the article.

But, OK, he called it.

On this board aroudn 2013-2015 I seem to recall that most felt he would win 0 more, or 1 more.

But what do people think now? With Djokovic and Murray's woes being a major factor, and still no really really top young player, I think it reasonable that Federer could add another 1 more this year, and perhaps 2 more for the rest of his career. Say 22 final total looking reasonable?