Sri Lanka posted a comfortable 9 wicket victory over hosts Zimbabwe in final of the Tri-nation cricket series at Harare today.Chasing the victory target of 200 runs, the Sri Lankan players completed the job in only 34.4 overs. Tilak Ratne Dilshan was the top scorer who made 108 runs not out.Earlier, put into bat, Zimbabwe made 199 in 49 overs. Tatenda Taibu hit 71 runs.