Runaway Wadworth 6X West of England Bristol & North Somerset Division leaders Lansdown emerged from their closest game of 2014 to date with their 100 per cent record intact.
Lansdown appeared on course for another comfortable afternoon at second-placed Winterbourne after bowling the hosts out for 121.
Josh Smith took 3-28 and Harry Veal bagged 2-9 from seven overs as Winterbourne were dismissed in the 41st over.
It took a vital unbeaten 42 from opener Jordan Smith to ensure Lansdown reached their low target in reply, however, as a usually prolific batting line-up struggled for runs.
Jackson Hamilton (19) was the next highest scorer and the visitors got home with two wickets to spare in the 33rd over.
