Central Coast Mariners have gone six points clear at the top of the A-League after coming from behind to beat nearest rivals Adelaide United 3-1 at home. Substitute Mitchell Duke struck twice in the space of six minutes in the second half to turn around the deficit created by Daniel Bowles\' 39th minute goal, which came courtesy a deflected shot. Duke came off the bench on the hour mark and made an instant impact, levelling in the 67th minute. Daniel McBreen passed up the chance to put the Mariners in front when his was penalty saved. Not that it mattered as Duke rifled home a second moments later before Michael McGlinchey wrapped it up two minutes from time. From FIFA