After Kolkata Knight Riders lost their opening IPL encounter against Mumbai Indians by 49 runs here on Wednesday, skipper Dinesh Karthik said that rustiness was the reason behind the defeat.

"I think we had areas to do well with bat and ball. I think it was a pretty rusty day to be honest, I don't want to get too analytical about it but it's ok the boys realise where they could have done better," said Karthik on Star Sports at the end of the match.