Veteran pacer S Sreesanth opted out due to personal reasons.
The Rawalpindi Express had threatened Uthappa during the 2007 One-Day International series.
A glance at the Kerala players who will be on view this IPL.
Samarth and Devdutt Padikkal (101) put on 249 for the first wicket as Karnataka amassed 338/3 in 50 overs. Kerala could only manage 258 in reply.
Kerala rode on the consistent performances of senior players Sachin Baby, pacer S Sreesanth and outstation professionals Robin Uthappa and Jalaj Saxena to progress from a tough group.
Chasing a daunting target of 352, Railways were bowled out for 344.
This was Kerala's second victory on the trot in Elite Group C.
Kerala were 233/4 in 38.2 overs when rain ended play and were declared winners by VJD method against Odisha in Elite Group C.
It was Kerala's third win on the trot in Elite Group E, while Delhi suffered their first loss in three games.
The incident happened right after Uthappa dropped a Sunil Narine skier in the fifth ball of the third over.