Qatar Petroleum is believed to be the next  emerging markets borrower considering tapping the JBIC-guaranteed Samurai  market, according to a source. Rumours have been rife for some time that a Middle East quasi-sovereign is eyeing the yen market at levels tighter than the record-low pricing set by Turkey on March 8,  a story that IFR reported after bankers said they had responded to an RFP for such a deal. Qatar Petroleum’s RFP implies that the issuer must have negotiated the small print and the fine details with JBIC.