Kevin McStay says Aidan O'Shea was virtually "unmarkable" in Mayo's excellent display against Galway in the Allianz Football League.

Mayo gave their chances of survival in Division 1 a timely boost as they hammered their Connacht rivals by 15 points, scoring three goals in the process and building up a 2-17 to 0-07 lead by half-time.

Speaking on RTÉ's Allianz League Sunday, McStay reserved praise for O'Shea's performance in the full forward line.

"Today's display is anchored and predicated on the positioning of Aidan O'Shea at 14," he said.

"If he's appropriately selected, positioned and more importantly utilised, he really is unmarkable at times.

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"Today he was unmarkable. He's fit, he's hungry, he's committed. He's had a short enough club season, he's captaining the team and I've been saying this for the past few weeks, he's in great shape."

Pat Spillane, who added that Mayo used O'Shea well with long diagonal passes in his direction, was suitably impressed by the way Mayo attacked in the opening period as they dismantled Galway's defensive ranks.

"Their first half performance was the best first half performance I've seen of all the matches over the weekend," he said, also praising the performance of Mark Moran.

"It was scintillating football, attacking football at its very best. They created 21 chances, converted 19 of 21. A wonderful 35 minutes of football."