Shayne Cahill is chasing the biggest win of his training career when Morty tackles Saturday’s $107,250 John Letts Cup (1800m) at Morphettville.

Top jockey Kayla Crowther will chase a second Country Cup in eight days when she partners Call Me Shamus in today’s $107,250 Gawler Cup (1500m).

Quality mare Diamonds defied a big drift in betting to score an impressive first-up win in a heat of the Gytrash Series at Morphettville on Saturday.

South Australian trainers have more Victorian Country Cup features in their sights.

Top trainer Will Clarken will saddle up almost a third of the field in search of a maiden Balaklava Cup victory today.