The SSE Airtricity League Premier Division title race will go down to the final weekend.
Dylan Watts scored to give Shamrock Rovers a 1-0 win over Dundalk last night.
It means they are 2 points behind leaders Shelbourne ahead of the final round of fixtures.
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A win for Shels over Derry would see them crowned champions but anything less would open the door for Rovers to snatch their 5th success in a row.
Waterford will provide the opposition for Stephen Bradley's men on Friday night.
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The First Division play-off semi-final second legs take place this afternoon.
Bray Wanderers take a 2-nil advantage into their meeting with UCD at Belfield from 5pm.
Before that, Athlone Town are 1-nil up on Wexford ahead of their clash at Ferrycarrig Park at 3pm.
