Casserly first came to prominence on the inter-county scene with Cork as part of the Redmond's selection in 1892. That year he lined out in his first provincialdecider with All-IrelandchampionsKerry providing the opposition. An exciting game developed, however, at full-time Cork were the champions by 5-3 to 2-5. It was Casserly's first, and only, Munster title. Cork's next game was an All-Ireland final meeting with Dublin. The game was a controversial one as refereeDan Fraher changed his mind after initially awarding a goal to Cork. He eventually decided that the GAA's Central Council should decide the matter. Dublin, however, had walked off the field and, because of this, Cork were awarded the title. It gave Casserly an All-Ireland title.