Ciarán Flaherty looks at the battles that might decide Sunday's clash

Jonny Cassidy v Jerome Johnston

Despite it only being his second year on the panel, Cassidy become a vital part of the Fermanagh defence. With the loss of the Cullen twins, Che and Lee, who would have usually been assigned the man marking role, Cassidy is the most likely to pick up that mantle on Sunday.

Fast and aggressive any ball won by a Down forward against him at the weekend will be hard fought and even at that they will find it difficult to make any headway against him.

The 21 year old also has a massive engine and will not be afraid to break out of defence to help start a counter attack. The best defender in the county at the minute he will have to show all of his quality on Sunday.

Cassidy will most likely pick up Down's Jerome Johnston. The Kilcoo forward has plenty of pace and an eye for goal. Johnston is a top class forward and will have some say on the game but if Cassidy can keep that influence to a minimum it will be a big step toward victory for Fermanagh.

Eoin Donnelly & Ryan Jones v Caolan Mooney & Dylan Ward

Fermanagh midfield partnership of Donnelly and Jones have tons of experience of what it takes to win an Ulster Championship game.

Donnelly has for so long been the driving force behind this Fermanagh team and as captain he consistently leads from the front. With Jones alongside him they have the ability to control matters against Down. While Donnelly will do a lot of the grunt work, Jones will be able to dictate matters, dropping back to cover in defence while also well capable of driving forward and setting up scores or taking a few himself.

For Down, Mooney has pace to burn and it will be interesting to see how Fermanagh handle this as he will likely be the platform for Down to launch attacks from deep in their own half with driving runs.

Ward will be making his Ulster Championship debut if he features but he has all the quality to excel at this level. A vital player for the dominant Kilcoo team, Fermanagh will have to be wary of his smart attacking runs and range of passing.

Tomás Corrigan v Ryan McAleenan

'Mossy' is Fermanagh's greatest scoring threat when he is supplied with enough ball. The Kinawley man returned to the panel this year and after some early setbacks is back up to speed. Fermanagh need all their best forwards on the pitch to ensure victory on Sunday and Corrigan is one of them. Accurate from placed ball as well as from play the closer he is to goal the better.

Warrenpoint's Ryan McAleenan could be given the job of curtailing Corrigan. With Darren O'Hagan out he is the next best man marker for Down. A fine reader of the game and deceptively quick he is also not afraid to push forward if the chance arises.