Defending Twenty20 champions Sussex preserved their 100 per cent record to win the South Group top of the table clash against previously unbeaten Glamorgan at the Swalec Stadium.

In an enthralling contest of twists and turns Glamorgan won the toss and made a competitive 143 for six in their 20 overs on a Cardiff pitch that had been used for two previous Friends Provident t20 matches.

But on the slow surface Sussex reached their target by three wickets with seven balls to spare.

The key moment came in the 18th over when Chris Nash took the pressure off the Sussex chase by pulling fast bowler Shaun Tait over midwicket for six.

Nash, who made 28 from 18 balls, was out five balls later but Sussex's fifth win from five outings was assured.