El Dude said:
If he wins one more and reaches the second week at the other two, that's another ~3,000 points or so, and brings him to almost 7,500 without any other tournaments - and he's still going to play the WTF, three Masters, two ATP 500s, and an ATP 250.
Depends on your defintion of "second week", I guess - he'd have to get a QF and a SF at least to get into the region of 1000 points from 2 GS, if he doesn't make the final in either. And since he's currently got just over 4000 race points, it would only get him to around 7000, I think.
Of course, nonetheless he would be a serious contender if he wins another GS.
On the other hand, given his schedule, we can pretty much put to bed the idea that he could get to #1 without winning another slam, which some have suggested.
Of course, mathematically it is possible. Let's look at the theoretical maximum points available without another GS win, given his conjectured schedule.
Three more GS finals = 3600 points.
Two more MS titles = 2000 points.
Two more 500 wins = 1000 points
Stuttgart W = 250 points
Undefeated WTF win = 1500
So a total of 8350 points, to add to his current tally of 4045, for an absolute maximum of 12395 points.
More likely than not, that would be enough for #1 - but of course there is no way he is going to get those kind of results. If he reached the RG final, it would be a huge surprise. From 2010 onwards, the only year he reached two GS finals was 2015, so reaching three is already a tough ask. Can we really expect Fed to win every MS tournament he enters (even if he only enters 4)? It quickly becomes very hard to see how he would end the year on 10000 points or more, which every year-end number 1 has had since the rankings began. Let's remember Roger's early loss in Dubai this year.