A B767 PIC RPT ON THE POSSIBLE HAZARDS DURING A SPLIT POS OP AT MIA; FL. RPTR EXPERIENCED A NEAR GND COLLISION WITH TAXIING TFC.

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MIA GND CTLR RUNNING ALL FREQS AND FLT/GND OPS. WE WERE INSTRUCTED TO TAXI VIA TXWY Y AND TXWY S TO OUR REQUESTED RWY 9R DUE TO OUR HVY LOAD. AS WE APCHED TXWY S ON TXWY Y; A B737 EXITED ON TXWY Y AND CAME STRAIGHT AT US. I WAS WATCHING HIM EXIT AND; OPTING ON THE SIDE OF CAUTION; HAD SLOWED OUR ACFT TO A WALK. WHEN I REALIZED THAT WE WERE GOING HEAD-ON; I STOPPED OUR ACFT AND FLASHED MY TAXI LIGHTS AT THE OTHER ACFT. HE CONTINUED THROUGH TXWY Y AND MADE A CONTINUED R TURN VIA THE PARALLEL TXWY TOWARDS HIS PART OF THE RAMP. HAD I NOT RECOGNIZED EARLY THE POTENTIAL CONFLICT; I AM SURE WE WOULD HAVE BEEN HIT BY THE OTHER ACFT. MY FO STATED THAT HE HAD HEARD THE CTLR; WHO WAS INVOLVED DURING THIS INCIDENT WITH A LENGTHY IFR CLRNC TO SOME OTHER ACT; ISSUE A LNDG CLRNC WITH '...AND EXIT AT TXWY V' INSTRUCTION. I ASSUME IT WAS FOR THAT FLT BUT CANNOT CONFIRM THAT. WHEN THE CTLR WAS ONCE AGAIN FREE I TOLD HIM ABOUT THE INCIDENT AND HE STATED THAT THE B737 HAD BEEN INSTRUCTED TO USE TXWY V. I AM VERY CONCERNED ABOUT THIS ONE CTLR AT NIGHT; AT A MAJOR ARPT SIT AND HOPE THAT IT IS LOOKED INTO SOON.