Federer played at 50% and still defeated Tsonga in a really intense match.
Delpo didn't showed anything this 2013, the highlight is a loss to Chardy in slow hardcourt.
I'm not stupid, dude, I know it's not 2004-2007, but Fed played great tennis for the most of last year, and the early rounds of AO. I'm stick to that opinion, Federer easily taking the title. Take it, or leave it.
I'm not sure we watched the same match. But as you said, Federer played great in the first few rounds of AO and he suddenly was 50% against Tsonga? I suppose that could have nothing to do with the fact that Tsonga is a much tougher opponent than the ones Federer faced previously and can put Federer under far more pressure.
I say your prediction will be wrong. Federer can definitely take the title, he's the favorite to do so actually, but it will not be easy unless Delpo and Tsonga lose early - even then, more players in the draw could give Fed a tough time. Both Tsonga (if he draws Fed in semis) and JMDP will at worst push him. Just look at the last 4 matches Federer played against each of them, when did he ever win easily?
Federer easily. This del Potro won't even make the finals.
He's better than last year, and so was his AO. He reached QF in 2011 because of a ridiculously easy draw and then got routed by Federer, he played much worse than vs Chardy in pretty much all of his matches in AO 2011. AO 2012, he at least played great in the first two rounds and even if he had an off day vs Chardy a loss to an on-fire Chardy is far from horrible. Watching the matches and not just looking at the scoreboard, Delpo's 2013 AO was far more encouraging than 2012, where he basically limped his way through very weak opponents until inevitably getting demolished by a Federer that didn't even need to play well.