Mendis, although classified as slow-medium, bowls a mixture of deliveries, including googlies, off-breaks top-spinners, flippers and leg-breaks, as well as a Carrom Ball, released with a flick of his middle finger. For Sri Lanka Army in 2007-08 he averaged a mere 10.56 and took 46 wickets in six games, his strike rate a startling 31. This gained him a call-up to the full Sri Lanka squad for the Caribbean tour in April 2008.
His best bowling performance in a one-day international came in the final of the 2008 Asia Cup, where he took 6 wickets for 13 runs in just his eighth match. His 17 wickets in the tournament earned him the Man of the Series award.
Ajantha Mendis won the Emerging Player of the Year award at the LG ICC Awards ceremony held in Dubai in September 2008.