Lorenzi and Robert keep creeping up. Generation Federer lives on!
Anyhow, as to 10isfan's question, at this point in the year, Race to London rankings are more accurate in terms of overall performance and projected year-end finish. Here is how it looks right now, as of 8/22:
1. Novak Djokovic 9040
2. Andy Murray 7825 (-1215)
3. Milos Raonic 4375
4. Kei Nishikori 3595
5. Dominic Thiem 3025
6. Rafael Nadal 3020
7. Stan Wawrinka 2820
8. Gael Monfils 2635
9. Tomas Berdych 2530
10. Marin Cilic 2310
11. Roger Federer 2130
12. David Goffin 2130
13. Nick Kyrgios 1825
14. Pablo Cuevas 1635
15. Roberto Batista Agut 1590
16. Jo-Wilfried Tsonga 1530
17. Bernard Tomic 1445
18. Grigor Dimitrov 1420
19. Lucas Pouille 1399
20. David Ferrer 1360
Andy is far from out of the race for the #1 ranking. He's still got a lot of ground to cover, but there's a ton of points left. If he wins the USO and defeats Novak in the final, he's only about 400 behind. Then there's Shanghai (1000), Paris (1000), one of Tokyo and Basel (500), and of course the World Tour Finals.
Federer is stuck at 2130 for the rest of the year and will be lapped by several players. 2130 would have had him finishing #16 in 2015, so he's likely to finish somewhere in the #14-18 range.
Ferrer is dropping quickly, so it is looking like Generation Federer is truly on the way out. This will be the first year since 1999 that a member of that generation (b. 1979-83) hasn't been in the year-end top 10; in 1999, Andre Agassi was #1 and Sampras still #3. If Roger is healthy next year he might have a swan-song back into the top 10, but it isn't assured. Either way, an era is truly ending.
The World Tour Finals is still somewhat up for grabs. Novak and Andy are in, and Milos and Kei will almost certainly make it, but that leaves four up-for-grab spots. I would think Rafa, Thiem, and Stan will make it, and that Cilic or Berdych will pass Monfils for the final spot. Stil, there's a lot of points left to be played for...
Cuevas is the surprise member of the top 20, although with clay season in the rearview I could see him sliding out.
Of Young Guns age 21 and under, in the #21-100 range, Zverev is at #24, Coric at #34, Edmund at #57, Fritz at #59, and Nishioka #70, with Khachanov at #101, and Tiafoe at #104.