Westwood's positive hitting, including eight fours in his 58-ball stay, set the tone before Maddy and Clarke put on an unbroken stand of 47 to see their side home and boost their chances of staying up.
Alam swiped his third ball over the VIP stand at mid-wicket and when he just cleared long-on for six more in the next over from Fernando it left 13 needed from the final six balls.