With Thiem's loss, Grigor has clinched #4 ranking independent of what happens in the last RR match.
Sadly this will now give Dimitrov a false sense of his game. Gonna be a real blow to his ego next year when he falls back down the rankings to around 12-15 where he belongs. Seriously - WHO has he beaten this year? I looked it up - prior to the WTF his only 3 Top 10 wins came in the same tournament - Brisbane at the start of the year. Yes, that's right...prior to this week Dimitrov had not beaten a ranked inside the Top 10 at the time of their match.
Brisbane - 5 - Nishikori - F
Brisbane - 3 - Raonic - SF
Brisban - 8 - Thiem - QF
Other than these 3 wins the first week of January 2017 - prior to the WTF, he lost to every Top 10 player he played
AO - 9 - Nadal - SF
Madrid - 9 - Thiem - R16
Wimbledon - 2 - Federer - R16
Beijing - 1 - Nadal - Final
Shanghai - 1 Nadal - QF
Other players he beat at big tournaments?
Sofia - 11 - Goffin - F
Cincy - 23 - Kyrgios - F
Other players he lost to in early rounds?
Rotterdam - 11 - Goffin - QF
IW - 18 - Sock - R32
RG - 23 - Carreno Busta - R32
Stockholm - 19 - DelPo - F
Paris - 14 - Isner - R16
So pardon my skepticism about Dimitrov's chances of remaining in the Top 10 - let alone to Top 3-4 - when Murray, Djokovic, Wawrinka, etc., return next year. Espeically since DelPo will most likely make his move to get back into the Top 5. He has 0 points to defend at the AO and Dimitrov has 720 points to defend. As much as I've side-eyed Nadal's return to #1 in this injury-filled year...my eyes are literally going to get stuck in the back of my head if anyone claims that Dimitrov will be in the Top 5 this time next year. He played 22 regular events this year - and didn't make it past the R16 in 12 of them. THAT is how decimated the men's game has been this year. 1 big win and they're in the Top 10 doing their "I"m the kind of the world!" routine. If Dimitrov successfully defends his Cindy title I'll need smelling salts to bring me out of a stupor.