Ajantha Mendis bettered his own T20 record by taking six wickets for just eight runs as Sri Lanka walloped minnows Zimbabwe by 82 runs in the opening match of the World Twenty20 cricket tournament, here on Tuesday.Dilshan Munaweera,Jeevan Mendis,Cricket,Brendan Taylor,Daniel Vettori,Zimbabwe,Indian Premier League 2011,Tillakaratne Dilshan,Ajantha Mendis,Kumar Sangakkara,Nathan McCullum,Sri Lanka,Kings XI Punjab,ICC World Twenty20 2012,Graeme Cremer,Rajasthan Royals,Kochi Tuskers Kerala