Indeed, like his sometime rival George Soros, he appears to aspire to the role of worldly philosopher.

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Like his Davis Cup team-mate and rival Tim Henman, Rusedski's favourite surface is grass, which is no surprise given that he holds the ATP Tour record for the fastest serve - 149mph.

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Asked about the competition, Zuckerberg made it sound like his company was a decade ahead of its rival rather than the other way around.

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There's not a trace of the backstage machinations--like those yielding his sly victory in 2001 over rival French billionaire Bernard Arnault for control of Gucci--that have punctuated his 50-year career and captivated the international business press.

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Like his late-night competitor Jimmy Kimmel, he has joked on his show about a move to rival ABC.

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If he could make that charge stick, it would hurt his rival, but perhaps not as much as he would like: many Americans are not unhappy with the idea of a bit of wealth-spreading these days.

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Institutional affiliation is also a factor -- a study from his lab found that Berkeley students tended to like their school colors, blue and gold, more than their rival school Stanford's colors, red and white.

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