Patrick McBreaty slots over the opening point from a free.

We're underway and, just seconds in, Tyrone keeper Niall Morgan is forced to save from under his bar from Patrick McBreaty's attempt from wide on the right.

Oisin McConville
Armagh's All-Ireland winner on BBC2

I went for Donegal at the start of the Championship and I am not going to change my mind now. But they will face the toughest of opponents in Tyrone.

Both managers make two changes to the teams announced earlier.

For Tyrone, Cathal McCarron is preferred to Rory Brennan at centre half-back while Conor Myler makes way for Rory Brennan at wing half-forward.

Hugh McFadden and Caolan Ward are out of Donegal's starting line-up with Eoin McHugh and Eamon Doherty taking their places.

Tyrone came from four points down to beat Donegal 0-13 to 0-11 in the 2016 Ulster final - that has no bearing on today's showdown, according to Donegal manager Rory Gallagher.

It's been a good weekend for Derry. Their Minors have just won the Ulster semi-final against Antrim by 3-17 to 0-10. So a third provincial final on the bounce for Derry and they will face Down or Cavan in the decider.

It follows yesterday win by the Oak Leaf county's Seniors in the All-Ireland qualifiers. Damian Barton's men saw off Waterford 1-17 to 0-13 at Fraher Field.

Image source, Press Eye

It is a clash of the Titans in the Ulster Championship as Donegal take on Tyrone in the semi-final at Clones.

This is the sixth Championship meeting between the counties in seven seasons, the most recent being last year's provincial final which Tyrone won 0-13 to 0-11.

Before that Donegal had won four in a row against Mickey Harte's men and their fans believe they can topple the Red Hands again.

Tyrone are the slight favourites at St Tiernach's Park but this has all the makings of a really close encounter.

Whatever happens, you can follow the action with us here, on BBC2 television and Radio Ulster medium wave.