Karachi, Jul 6 (PTI) Ajantha Mendis broke India's back with a mesmerising six-wicket haul as Sri Lanka won the Asia Cup cricket tournament with a facile 100-run victory here tonight.

Chasing 274, India's much-vaunted batting attack was bamboozled by Mendis' bag of tricks and the mystery spinner emerged as the wrecker-in-chief to bundle out India for 173 in just 39.3 overs.

Mendis' bowling figures read an impressive 8-1-13-6 and this was the first six-wicket haul in the Asia Cup history.

India's ploy of having an additional batsman did not pay dividend and only Virender Sehwag (60 off 36) and captain Mahendra Singh Dhoni (49) managed to salvage their reputation.

The Indian batsmen thus let down their bowling colleagues, who had earlier done a decent job by bowling out Sri Lanka for 273 in 49.5 overs, a total built around Sanath Jayasuriya's 125-run knock off just 114 balls.

Chaminda Vaas started the rot by removing Gautam Gambhir (6) in the fifth over before Mendis took over.

In his first over, Mendis foxed an onrushing Sehwag with a 'flicker' to get him stumped and two balls later, he flicked another through Yuvraj Singh's gates to castle him for a duck.

In his third over, Mendis disturbed Suresh Raina's (16) timbers before trapping Rohit Sharma (3) plumb in front four runs later. In the 32nd over again, he scalped Irfan Pathan and RP Singh off success deliveries to complete his six-wicket haul.