B737 captain reported striking a wingtip on landing after a circle to land approach.

Attributes
ACN	1107952
Time
Date	201308
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Landing
Route In Use	Visual Approach
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 240 Flight Crew Total 12000 Flight Crew Type 8000
Events
Anomaly	Ground Event / Encounter Ground Strike - Aircraft

Narrative:

[While inbound I] reported interval traffic and field in sight to approach. Was then cleared for a visual approach to follow a B757 and told to maintain 170 KTS until 5 DME. Switching to tower frequency; was told that we had a 20 KT speed advantage on the aircraft ahead. Requested circle to [another] runway to de-conflict traffic. Tower approved circle and asked us to 'keep it tight' for following traffic. On flare to land experienced untoward and uncommanded roll moment on touchdown. Landing felt like a 'double' landing. Aircraft was met by fire trucks and was informed of possible flap damage. [We] taxied to gate uneventfully. Post flight inspection confirmed wingtip scrape with associated damage to flap track canoe on outboard right wing. I believe this incident was my fault for circling too tight to the runway. It would help for additional training on approaches to be given in recurrent training annually.

Original NASA ASRS Text

Title: B737 Captain reported striking a wingtip on landing after a circle to land approach.

Narrative: [While inbound I] reported interval traffic and field in sight to Approach. Was then cleared for a visual approach to follow a B757 and told to maintain 170 KTS until 5 DME. Switching to Tower frequency; was told that we had a 20 KT speed advantage on the aircraft ahead. Requested circle to [another] runway to de-conflict traffic. Tower approved circle and asked us to 'keep it tight' for following traffic. On flare to land experienced untoward and uncommanded roll moment on touchdown. Landing felt like a 'double' landing. Aircraft was met by fire trucks and was informed of possible flap damage. [We] taxied to gate uneventfully. Post flight inspection confirmed wingtip scrape with associated damage to flap track canoe on outboard right wing. I believe this incident was my fault for circling too tight to the runway. It would help for additional training on approaches to be given in recurrent training annually.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.