London held off a second-half Derry comeback to win 3-11 to 1-15 in the Christy Ring Cup quarter-final.
The Exiles led 3-10 to 0-7 at half-time and clung on as time ran out for Derry in the closing stages at Celtic Park.
Two goals from Luke Hand and a Martin Finn strike helped London lead by 12 points at the interval.
Paddy Henry's goal after the break gave Derry hope and the Oak Leafers missed several other goal chances as they steadily cut London's lead.
London join Wicklow, Down and Saturday's other winners Meath in the semi-finals of the competition.
The semi-final draw has yet to be made.
WEEKEND GAA FIXTURES
Christy Ring Cup quarter-finals
Derry 1-15 3-11 London
Meath 1-16 0-16 Kildare
Leinster Hurling Championship
Westmeath 0-14 0-12 Antrim
Carlow 0-13 0-20 Laois
Nicky Rackard Cup quarter-finals
Sligo 1-9 3-15 Louth
Roscommon 2-19 1-11 Monaghan
Ulster SFC preliminary round
Cavan v Donegal [Kingspan Breffni Park, 15:30]
Roscommon v Galway [Dr Hyde Park, 16:00]
Westmeath v Louth [Navan, 15:30]
Longford v Laois [Pearse Park, 15:30]
Limerick v Waterford [Gaelic Grounds, Limerick, 15:30]
Lory Meagher Cup
Longford v Liatroim [TBC]