Dutchwoman Sifan Hassan's dream of an unprecedented treble looked under threat on Monday as she tumbled and fell in her 1,500 metres heat but she recovered brilliantly and pushed hard to win her race and advance to the semi-finals.

TOKYO: Dutchwoman Sifan Hassan's dream of an unprecedented treble looked under threat on Monday as she tumbled and fell in her 1,500 metres heat but she recovered brilliantly and pushed hard to win her race and advance to the semi-finals.