Defending champions Cavan put their Ulster football title on the line today.
They will hope to put some poor league form behind them as they meet Tyrone in the quarter-finals.
Throw-in at Healy Park in Omagh is at half-four.
Elsewhere, the two Munster semi-finals are also down for decision.
Holders Tipperary host Kerry at Semple Stadium from 7pm.
Before that at 3 o'clock, Limerick take on Cork at the LIT Gaelic Grounds.
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Antrim and Laois meet in the All-Ireland Hurling championship preliminary round qualifier this afternoon.
There's a half-two start at Parnell Park, with the loser facing relegation to the Joe McDonagh Cup.
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Two All-Ireland titles are up for grabs at underage level this evening.
Galway will attempt to win their fourth title in a row when they meet Kilkenny in the 2020 minor hurling final at O'Moore Park from 5pm.
At a quarter-past-7 in Nowlan Park, Dublin and Cork clash in the 2020 U-20 hurling decider.
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All-Ireland champions Dublin are among the sides in first-round action in the All-Ireland Ladies Senior Football Championship this afternoon.
Mick Bohan's charges meet Tyrone in Kingspan Breffini from 2pm.
Elsewhere in the top tier at the same time, Armagh take on Monaghan while it's Cavan against Mayo.
Birr is the venue for the meeting of Cork and Meath.
Last night, Galway beat Kerry by 2-11 to 2-10 in Ennis.
