Guan Tianlang fired a 75 to finish on 12 - over 300 to claim the Silver Cup as low amateur .
Guan Tianlang is the 14 - year - old Chinese schoolboy who is the youngest player in Masters history .
Guan Tianlang , the 14 - year - old Chinese schoolboy who is the youngest player in Masters history , fired a 75 to finish on 12 - over 300 to claim the Silver Cup as low amateur .