Just to add something into the mix , and is not meant in any way to take anything away from Murray's achievement.
Andy Murray I'd no onager just the tennis player Andy Murray - he is also the brand Andy Murray. A brand that is image and sponsorship deal managed by X1X. Who also manage the image and personal sponsorship / endorsement of Lewis Hamilton and David Beckham.
Murray has numerous sponsorship / endorsement deals - incl £20Mil from Adidas, a reported 5 Mil from RBS, 1 Mil from Highland spring. With the Wimbledon title, and career peaking at the right time, he will be in line for several more big endorsement deals.
getting the top end deals needs two things: being at the top of your game in the sport you play, and having a marketable image. Murray is clearly at the top of his game - but for years was the dour man that insisted on being called Scottish rather than British.
over he last couple of years though, he has been happier to be called a Brit player. Possibly he mellowed on the whole thing, but more likely his image people told him to play along as it makes him more marketable. In the much same way, have you noticed the news being less about mr sour face, and more planted stories about Andy's great sense of humour? All the work of an image team
in context, Roger Federer was getting over 75 Mil a year at peak in sponsorship / endorsement deals - although is now past his peak, so less attractive to marketing people and with lower earning power.
Rafa Nadal - an image persons ream, and worked it for years. But now injury prone , so a big risk.
Novak - already tied into numerous, lucrative, deals.
Murray - getting about 20 Mil a year at moment, potential to get into the Rafa and Federer league if image carefully managed. In short, he is hot property right now.
Fwiw, I say good luck to him - the time he will have at this earning potential is quite small, a handful of years, so I would maximize it as well.
of course, it can all go wrong if there is scandal in the press, eg lance Armstrong and drugs, and Wayne Rooney lost the Coca cola and other deals after his affair was made public - Tiger Woods was dumped by sponsors for the same thing.