Andy Murray has met Anthony Joshua many times and will undoubtedly be rooting for him when the boxer defends his IBF heavyweight title against Dominic Breazedale on Saturday night.
But even if the bout at the O2 Arena hadn't been scheduled shortly before one of the world No.2's biggest tournaments of the year, the chances of him going to watch it live would be pretty slim.
Murray is a boxing aficionado, 'geeky' about the sport even, according to some who know him, and will watch obscure fights in far flung places on internet streams on his laptop. Yet he struggles with the brutality of seeing people he knows battling it out in the ring and tends to stay away.
The 29-year-old's approach to pugilism may run counter to expectations, but so do many things with Murray. This is a guy for whom following the crowd must be like anathema, in everything from his commercial deals to his press conferences and on-court demeanour.
Murray, the occasionally aggressive-looking on-court bawler, is known for his love of his family border terrier, Maggie May, for instance. He does ambassadorial work for the charities United for Wildlife, World Wildlife Fund and UNICEF.
He takes pride in doing things a bit differently," said business partner Matt Gentry. "He's his own man. He follows his heart and does what he thinks is right."
Murray has split opinion over the years, famously becoming more Scottish than British in some parts of the UK press when he wasn't doing so well at the beginning of his professional career.
Such was the love-hate relationship a decade ago that some British newspapers latched on to a joke he made about not supporting the English football team and made it an issue which stuck.
These days, and it was clear during Queen's with the European Championship in full swing, he is extremely wary of any questions -- however innocuous -- which have the slightest potential to land him in similar trouble.
The picture has changed considerably since but even now, as world No.2 and a more mature, marketable and respected figure in the game, his commercial endorsements annually are worth less than half those of Roger Federer, Rafael Nadal and Novak Djokovic.
Murray's estimated annual off-court earnings, with bonuses, amount to £12 million. He only has two major commercial partnerships -- with Standard Life and Jaguar -- outside his clothing and racket sponsors.
His kit deal is with Under Armour and, appropriately perhaps, the sports apparel company is seen as the challenger brand among the top three in its sector, trailing adidas and Nike in earnings by some distance.
The Murray narrative has never been about him milking his position as a sports star, though, and the conservative nature of his endorsements reflect that. He is simply not willing to devote great chunks of his time to represent his sponsors.
He owns four properties, but three of them he uses. The other, the luxury Cromlix hotel near the town he was brought up in, Dunblane, in Scotland, was bought more with an eye to refurbishing a place that had shut down and held memories for his family than to gain a cash cow.
The hotel may also help the area Murray has such an affinity with, and he has a commitment to 'give back' to his home country with a charity exhibition event in Glasgow later this year.
Indeed, instead of spending more time representing big brands, the player who loves fantasy football and other fantasy games for American sports, has invested in crowdfunding platform Seedrs and backed some British entrepreneurs through the firm.
The theme of spotting talent is likely to endure with Murray, too, as Gentry and the company set up to look after the player and his interests, 77 Management, is looking into developing budding young sports stars, with his playing retirement in mind.
Coaching could also be a possibility, as Murray is known to be a good analyst; as with boxing, he studies tennis in extensive -- according to Gentry, almost "forensic" -- detail.
But such occupations should be for some way down the line as Murray may be getting close to his peak in tennis and commercial terms.
"The respect he gets will take off in the next few years," predicted Clifford Bloxham, senior vice president at management and marketing company Octagon. "People are getting to understand him, he is a father now and someone who is willing to voice his opinions. All that is attractive.
"He has come out very strongly against drugs, too. He has just been unfortunate to be around at the same time as Federer, Nadal and Djokovic -- and the first two have been textbook in marketing terms."
A sign of Murray's growing popularity is his reach on social channels such as Twitter, on which he runs his own account and has more than 3.5 million followers. He was also ranked No.31 in ESPN's recent World Fame 100 list and is said to have a strong and growing supporter base in China.
Recognition globally must have grown with major titles at Wimbledon, three years ago, and the US Open in 2012, as well as his breakthrough at the Olympics at the All England Club the same year.
Murray has won 37 tour titles since turning professional in 2005 and if, as seems reasonably likely, he contests most of the Grand Slam finals with Djokovic in the next few years, his 'reach' will be even greater.
The interesting and thoughtful answers he gives to journalists in media conferences already has probably improved his image in their reporting, and it has become clear that he takes his role as a senior player on the ATP tour seriously.
Several young players have benefited from Murray's advice, including Australian Nick Kyrgios and Briton Liam Broady, who will play him in the first round at Wimbledon next week.
"The great thing about Murray is that he is true to himself," Bloxham added. "It is better to be like that and make less money than be a fake and earn more. Andy is a competitor -- and a great guy."
Bloxham's view will no doubt chime with many on Murray Mound at Wimbledon over the next fortnight. His fans are unlikely to care whether he could bank more money.
He has earned more than £33m in prize money during his career and may have brought in twice as much off the court in that time.
Another Wimbledon title would add to both those totals considerably and there could have been more along the way if Murray had toed the commercial line. Sporting success for player and supporters alike, would probably mean a whole lot more.