Kuala Lumpur: Singaporean heavyweight Mardan Mamat joined local favourite R. Nachimuthu at the top of the halfway leaderboard of the RM180,000 Professional Golf of Malaysia (PGM) CCM-Impian Masters today. Nachimuthu, the reigning Professional Golf of Malaysia (PGM) Tour number one, battled to a three-under-par 69 at the Impian Golf and Country Club while Mardan, fresh from a…