Michael Phelps, not content with winning 18 gold Olympic medals, showcased his golfing ability at St Andrews on Friday with a mammoth 150-foot putt at the Old Course.

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Phelps, who participated in a pre-Ryder Cup event at the Medinah Country Club last week, is playing with Paul Casey at the famed Scottish golf course.

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His successful putt took an improbable 17 seconds to drop into the cup, prompting the American to describe it as "pretty cool".

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Phelps, 27, is enjoying his retirement from swimming after his London 2012 heroics in which he won four golds and two silvers.

He is however no match for Terry Wogan...