Tiger Woods' extraordinary golfing prowess has made him the wealthiest sportsman in the world - but behind every great sportsman these days, there is always an array of big businesses.
Is Tiger Woods' reputation hanging by a thread?
Nike has been Woods' biggest sponsor since the start of his career, signing its first contract with him as long ago as 1996.
Since then, other major companies have added their endorsements, including the Gatorade drinks brand and Gillette razors.
In fact, despite being the world's number one golfer, Woods makes far more money off the green than on it.
Last year, he earned $23m (£13.8m) from golf tournaments - a figure dwarfed by the more than $100m that his various sponsorship deals brought in.
So with his previously impeccable image now somewhat tarnished, amid continuing speculation about his private life following last week's car crash, his income is hugely dependent on how those sponsors are likely to react.
Rallying round?
In the long term, it is unclear whether the 33-year-old star's apology to his family for his "transgressions" will restore his clean-cut reputation or simply add to the perception of guilt.
But so far, the picture is mixed. Nike, Pepsico, TLC Vision and Electronic Arts all issued statements on Wednesday to the effect that their relationship with Woods was unchanged.
On Monday, Gatorade wished Woods well as he recovers from his injuries and said: "Our partnership with Tiger continues."
Others sound less committed. Gillette says its marketing strategy is unchanged, but has left open what might happen in the future.
More ominously, however, several other sponsors have yet to pronounce at all on the matter.
This week, companies such as watchmaker Tag Heuer and IT firm Accenture have continued to run advertising campaigns in the US media featuring Woods.
But they, and other big backers including telecoms giant AT&T, have so far been "unavailable for comment" on whether he still enjoys their full confidence.
