AIL at a glance
Jason Risdon (Old Belvedere)
It was tipped as a tight, low scoring affair, but Old Belvedere proved the pundits wrong with a 31-0 win at Young Munster and openside Risdon crossed for two tries. He played his part alongside Richie Leydon and Leo Avua'a in a dominant Belvedere back row.
One to watch
David Doyle (UCD)
Nineteen-year-old UCD hooker Doyle ran in a hat-trick in the students' six-try victory over Belfast Harlequins, the Ireland U-20 international showing a nose for the line to match his physical presence and all-round game.
Number of the week
6 Sides from across the divisions still winless after four games -- Thomond, Clonakilty, Suttonians, Rainey, Ards and Connemara.
Ballynahinch's 18-15 away victory over Ballymena means that they and UCD are now the only unbeaten teams left in the division and the Ulster side lead the students by a point.
David Doyle crossed for a hat-trick as Collidge easily defeated Belfast Harlequins 47-24, while Paul Emerick's two tries helped Malone to a 33-14 win over Old Crescent to go fourth behind Ballymena.
Midleton's narrow 18-17 triumph at Trinity puts them fifth, while Bective kept up the pace with an 11-10 win over Thomond in Limerick.
Queen's saw off Corinthians 21-19, while Terenure downed DLSP 21-5 and Old Wesley outscored Clonakilty 40-20.
Four wins from four matches means Instonians lead the way at the top after their 24-13 win over Rainey.
City of Derry slipped to a first defeat away at Greystones (23-18), while Seapoint are in third after beating NUIM Barnhall 34-8.
Sunday's Well were beaten 20-11 by Naas, Highfield beat Wanderers 26-12, Navan overcame Connemara 31-24 and Banbridge beat Suttonians 36-17.