Derry survived a spirited second-half comeback from London to make it two wins out of two yesterday.
First-half goals from Odhran McKeever and Alan Grant put the visitors in total control in an opening period that saw London's Damon McMullan and Eamon McGill both red carded for high challenges.
Shane Lawless's goal pulled the hosts back into the contest just after the half hour mark, but Cormac O'Doherty's seven points swung it.
Derry substitute Sé McGuigan's goal less than 10 minutes into the second half looked to have killed the game as a contest.
And when Eoghan Cassidy motored through just before the hour mark to smash the Oak Leaf county's fourth goal of the afternoon there was little sign of the renaissance to come. At that stage the hosts were adrift by 13 points but Jack Goulding started the fightback with a point, heralding a remarkable passage of play in which the hosts hit nine unanswered scores - led by tormentor-in-chief David Nolan who hit six of them.
A Kiernan Morrisey goal in injury-time reduced it to a three-point game but John McEvoy's men held on.
Scorers - Derry: C O'Doherty 0-7 (5f), E Cassidy, O McKeever 1-1 each; A Grant, S McGuigan 1-0 each; T Brady (f), P Cleary 0-2 each, C Kelly, S McCloskey. London: D Nolan 0-11 (5f), S Lawless 1-1, K Morrissey 1-0, J Goulding 0-2, D McMullan, K Reid, O Royston, S Lohan 0-1 each.
Derry - S Kelly 6; P Kelly 6, B Óg Magilligan 6, D Cartin 6; S Cassidy 7, E McGill 5, C Kelly 6; E Cassidy 7, P Cleary 7; T Brady 7, C O'Doherty 9, T McHugh 6; O McKeever 7, A Grant 7, R Mullan 6. Subs: S McCloskey 6 for R Mullan (22), S McGuigan 6 for O'McKeever (34), S Ó Caiside 7 for T McHugh (35), B Glass 6 for T Brady (70).
London - P Buckley 6; C McSweeney 6, C McCauley 6, J McCarthy 6; L Coughlan 6; K Reid7, B Hickey 6; D McMullan 5; D Corrigan 6; K Morrissey 7, C Nelson 6, D Nolan 9; A Sheehan 6, J Goulding 7, S Lawless 7. Subs: L Slyman 6 for B Hickey (10), S Lohan 6 for A Sheehan (45), P Muldoon 6 for C McSweeney (54), O Royston 6 for D Corrigan (57), S Lordon 6 for C McSweeney (59).
REF - T Walsh (Waterford).