A 14-man Munster came from behind in the second half of their United Rugby Championship game to beat Ulster at Thomond Park.
After retuning to the squad for Saturday's match, Munster's Simon Zebo was sent off in the first quarter, with his side then trailing for much of the game afterwards.
However, they climbed back to record a 18-13 win over Ulster.
Kilmacud Crokes overcame Naas 0-14 to 0-7 in the Leinster Senior Club Football Championship Final, with the Kildare side failing to get a score in the second half.
It was also the opening day of football's O'Byrne Cup. Kildare beat Westmeath by 0-19 to 0-8 while Dublin won Offaly 2-12 to 0-13.
Holders Longford came from behind to see out Louth 2-13 to 0-14. In the another O'Byrne game today, Wexford hammered Laois 6-10 to 0-13.
Elsewhere, in the McGrath Cup, Cork saw off Clare 2-9 to 0-10.
In the Munster Hurling Cup, Kerry scored a famous victory over Tipperary at Austin Stacks Park winning 0-17 to 0-14.
Roscommon have beaten Sligo 1-20 to 0-18 in their FBD League semi-final at the Connacht Air Dome.
In the FA Cup, Chelsea hammered Chesterfield 5-1 while Everton beat Hull 3-2.
Elsewhere, Dublin lad Evan Ferguson played a crucial role in Brighton's 2-1 win over West Brom.
Leicester pulled off a 4-1 over Watford at the King Power Stadium.
Meanwhile,Wes Hoolahan's Cambridge United pulled off a massive shock in the FA Cup, beating Newcastle United 2-1.
Crystal Palace avoided becoming an FA Cup giantkilling statistic when they came from behind to beat Millwall 2-1 at the Den this afternoon.
Patrick Vieira's side survived a late onslaught from the hosts to eventually ensure their name went into the hat for the next round.
Court documents suggest Novak Djokovic had a 'valid medical exemption' to waive him of a vaccine mandate, to travel for the Australian Open tennis.
His application shows he tested positive for coronavirus last month.
But the world number one's had his visa revoked, and is stuck in a quarantine hotel until the issue is resolved by appeal on Monday.
Seamus Power says he'll need two more rounds in the mid 60s this weekend if he's to contend at the Tournament of Champions.
He signed for an eight-under round of 65 in Hawaii last night to move to 10-under-par.
Power is inside the top ten and seven strokes behind leader Cameron Smith.