(Updates with play suspended for day) April 18 (Reuters) - South Korean K.J. Choi wielded a hot putter to vault into the lead before torrential rain and strong winds halted the second round at the $5.8 million RBC Heritage in South Carolina on Friday. Choi made use of his advantageous early tee time, holing out three times from outside 20 feet on his way to a four-under-par 67 to post a five-under 137 halfway total at Harbour Town on Hilton Head Island. Australian Robert Allenby was best of those whose rounds were interrupted, one stroke behind Choi after completing just five holes. His halfway score was two shots better than Englishman Luke Donald (69) and Americans Billy Hurley (69) and Scott Langley (73). Click here to read full news..