(Reuters) - Michael Phelps displayed ice-cool composure as a record-breaking Olympic swimmer but he was a bag of nerves on Wednesday when he played the "noisiest hole in golf" in the pro-am competition for this week's Phoenix Open. Phelps, who retired from swimming as the most decorated Olympian of all time after winning a record 22 medals including 18 gold, was paired with U.S. Masters champion Bubba Watson when he stepped on to the 16th tee at the TPC Scottsdale. ... More...