An important set of Randwick barrier trials featuring Blue Diamond Stakes winner Written By has been postponed because of rain.

Randwick received 53mm overnight and Tuesday’s 15 trials have been called off with a new date to be determined.

Written By, a leading contender for the Golden Slipper on Saturday week, was due to run in the second of two trials to be held on the refurbished Kensington track.

Credit: AAP