FGT X NON ADHERENCE TO ATC INSTRUCTION HAD NMAC WITH FGT Y. SEE AND AVOID CONCEPT. EVASIVE ACTION TAKEN.

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FGT X PROCEEDED INBOUND FOR THE OVERHEAD APCH RWY 5R I INSTRUCTED IT TO BREAK R NON-STANDARD AT THE NE FIELD BOUNDARIES TO PASS BEHIND AN FGT Y 3 MI TACAN APCH RWY 32L. THE FGT X BROKE L AND ENTERED A L DOWNWIND IN FRONT OF THE FGT Y. I ISSUED TFC TO BOTH. THEY BOTH RPTED EACH OTHER IS SIGHT. BOTH ACFT CONTINUED ON THEIR RESPECTIVE FLT PATHS AND DID NOT ALTER UNTIL THE FGT Y CAME WITHIN ABOUT 300 FT OF THE FGT X AND THEN THE FGT Y DIPPED BELOW THE FGT X AND MISSED BY ABOUT 50 FT. IN THE PUREST SENSE; BY ISSUING TFC AND EACH OTHER HAVING EACH OTHER IN SIGHT. I BELIEVE MY LEGAL REQUIREMENTS IN ACCORDANCE WITH FAA ORDER 7110.65F WOULD HAVE BEEN MET; HOWEVER THOUGH NEITHER ACFT COMPLAINED THEN OR LATER FOR ME IT WAS TOO CLOSE. IF THE FGT X AT THE SAME TIME AS THE FGT Y DECIDED TO AVERT BY GOING UNDER; THERE WOULD HAVE BEEN A RACE FOR THE DECK AND EVENTUALLY A BUILDING HIT OR A MID-AIR. IF I HAD A CHANCE TO DO IT AGAIN I WOULD HAVE DONE ONE OR MORE OF THE FOLLOWING. REITERATE TO THE FGT X THE NON- STANDARD R BREAK AND TFC TO PASS BEHIND. WAVED OFF THE TACAN FGT Y AS SOON AS THE FGT X BROKE WRONG. ASK THE FGT X TO RPT THE FGT Y IN SIGHT PRIOR TO THE ACFT REACHING THE BREAK POINT.