I noticed on Tennis Forum and MensTennisForum, they have threads which tracks the owner of the tennis belt, that being the person who beat the person, who beat the person, etc etc all the way starting back in 1973 or so when the first number 1 ranking was awarded. The first mens belt holder was the first number one, ie Ilie Nastase around the time of the US Open that year. 

Those who follow boxing will know they have this concept, you beat the champ and you take the belt, someone beats you and they take it and so on and so forth.

It is a bit of fun not to be taken seriously. De Minaur is the current mens belt holder at DC, for WTA Barty was top at end of 2019.

 So two aussie belt holders, be nice if GB ever achieved that! Of course, we may well have done in any of 1976, 2016 or 2017 when we had both mens and womens belt holders at some time in those years, but the detail is something I dont want to get into!

https://www.menstennisforums.com/threads/atp-championship-belt.637586/

https://www.tennisforum.com/12-general-messages/1294178-wta-championship-belt-2018-angelique-kerber.html

https://www.tennisforum.com/50071562-post85.html

I was interested in which British players had held the belt at anytime, didnt take too long to trawl through and came up with this list:

For Brits, over time, womens holders have been Wade, Barker and Konta!

For men, Cox, Taylor, Feaver, Rusedski, Henman, Murray and...Edmund!

WTA

1976 - Virginia Wade on 2 occasions

1977 - Virginia Wade on 3 occasions, Sue Barker on 2 occasions

And then a big gap!!

2016 - Jo Konta took the belt on 2 occasions, in Miami and later in Beijing

2017 - Jo Konta took it again in Eastbourne

2019 -  Jo Konta took it in Rome

I am not sure if any Brit took it in 2019, would have only been JK potentially, but the thread sort of ends at end of 2018. Anyone know if JK would have taken it at all this season?

ATP

1973 - Mark Cox 1 occasion

1974 - Roger Taylor 1 occasion

1975 - Mark Cox 2 occasions

1976 - John Feaver 1 occasion, Mark Cox 1 occasion

and then the gap starts

1997 - Greg Rusedski - 1 occasion

1998 - Greg Rusedski 2 occasions, Tim Henman - 2 occasions

1999 - Tim Henman 1 occasion, Greg Rusedski 2 occasions

2000 - Greg Rusedski 1 occasion, Tim Henman 1 occasion

2001 - Greg Rusedski 1 occasion

2002 - Greg Rusedski 1 occasion

2003 - Tim Henman 1 occasion

2004 - Tim Henman 2 occasions

and then...

2006 - Andy Murray 1 occasion

2008 - Andy Murray 3 occasions

2009 - Andy Murray 3 occasions

2010 - Andy Murray 4 occasions

2011 - Andy Murray 3 occasions

2012 - Andy Murray 4 occasions

2013 - Andy Murray 1 occasion

2014 - Andy Murray 1 occasion

2015 - Andy Murray 2 occasions

2016 - Andy Murray 4 occasions

2017 - Andy Murray 2 occasions

and then!

2018 - Kyle Edmund 1 occasion (at Australian Open, before losing it to Cilic...)

and then through 2019

2019
Karen Khachanov - 1 match
Stan Wawrinka - 2 matches
Roberto Bautista-Agut - 7 matches
Stefanos Tsitsipas - 1 match
Rafael Nadal - 1 match
Novak Djokovic - 2 matches
Philipp Kohlschreiber - 1 match
Gael Monfils - 1 match
Dominic Thiem - 3 matches
Hubert Hurkacz - 1 match
Felix Auger-Aliassime - 3 matches
John Isner - 1 match
Roger Federer - 3 matches
Dominic Thiem - 1 match
Novak Djokovic - 6 matches
Rafael Nadal - 13 matches
Roger Federer - 1 match
Novak Djokovic - 4 matches
Daniil Medvedev - 8 matches

Rafael Nadal - 5 matches

Dennis Shapovalov - 1 match

Novak Djokovic - 2 matches

Dominic Thiem - 1 match

Matteo Berrettini - 1 match (although Berrettini went out of RR after this it was a match that counted towards official count etc)

Dennis Shapovalov 2 matches (at Davis Cup he beat Berrettini and Fritz ) and then

Alex de Minaur (Current champion and Belt Holder) - De Minaur beat Shapo in DC QF round and of course Australia then got knocked out so he retains the Belt