Andhra rode on Ashwin Hebbar's 48 and Ambati Rayudu's unbeaten 38 to chase down the modest target of 113 in 17.1 overs.
The opener shot into limelight recently with his 37-ball 100 in the Syed Mushtaq Ali Trophy T20 match against Mumbai.
Himanshu had played a key role in the success of his sons.
The blistering knock against the formidable Mumbai is expected to make him a hot property in the IPL auction next month.
It was Kerala's third win on the trot in Elite Group E, while Delhi suffered their first loss in three games.
A native of Thalankara in Kasaragod district, the 26-year-old has become an overnight star with the match-winning hundred against Mumbai.
The 26-year-old's century, the first by a Kerala player in the Mushtaq Ali Trophy, set up the state's maiden win over Mumbai at the senior level.
The opener brought up his hundred off just 37 balls.
Kerala captain Sanju Samson was not one bit impressed by left-arm spinner Sagar Udeshi taking his own sweet time to adjust the field in the Mushtaq Ali Trophy opener against Pondicherry.
Kerala began their campaign with a six-wicket win in Elite Group E at the Wankhede Stadium.