Another steepling six followed before Gayle lofted a catch off Lee to Watson and Xavier Marshall chipped Johnson to James Hopes at mid-off.

BBC: Rampant Windies overpower Aussies

Former world No. 1 Luke Donald was tied for seventh on 66, while fellow 2012 Ryder Cup players Ian Poulter, Graeme McDowell, Lee Westwood, Dustin Johnson and Steve Stricker were on 68 in a group also including British Open champion Ernie Els, runner-up Adam Scott and Louis Oosthuizen -- who was second at the Deutsche Bank event.

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Last Wednesday, the judge received and opened a typewritten letter -- postmarked from Memphis, without a return address -- that included "suspicious content, " Lee County Sheriff Jim Johnson told reporters.

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Despite that setback, Boro again started the second half positively with Johnson trying his luck with a long-range effort before being replaced by Lee Cattermole after 53 minutes.

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Gayle, who marked the first match of the inaugural World Twenty20 in 2007 with a hundred, carved two of Brett Lee's first three deliveries for four while Fletcher hit a four and a six off Mitchell Johnson's opening two balls.

BBC: Rampant Windies overpower Aussies