Ayr United's bid to complete an unlikely play-off comeback went up in smoke on a gruelling night at Somerset Park.
Ruthless Partick Thistle showed no mercy as they ran in another five goals to add to their first leg advantage as Ayr were forced to play for more than an hour without talisman Dipo Akinyemi following a red card flashpoint in the first half.
Scott Tiffoney bagged a double while Jack McMillan and Steven Lawless also got on the scoresheet on a bitterly disappointing night for Ayr, who had hoped to launch a stirring fightback in the wake of last Friday's Firhill reverse.