Sourav Ganguly drew positives and negatives from his team's six-wicket victory over Kenya on Friday.
Ganguly's unbeaten 107 was his 21st one-day century
The India captain was delighted to have made his 21st one-day century - an unbeaten 107 - under the lights of Newlands in Cape Town.
And he also praised a "blinder" of an innings from Yuvraj Singh, who added a quick-fire 58 to chase down Kenya's 225-6.
But Ganguly was critical of India's efforts in the field, where they dropped four catches and were guilty of sloppy errors.
"We didn't do a good job in the field but that happens," he said, admitting that his side will have to get their "intensity" back if they are to progress.
"We were lucky and we will have to pick up our intensity level from now on because we have two tough games ahead against Sri Lanka and New Zealand."
Ganguly said that the three early wickets of Sachin Tendulkar, Virender Sehwag and Mohammed Kaif had piled on the pressure.
"We were in a bit of trouble with three wickets down.
"But I thought that Yuvraj Singh played a blinder to keep the run-rate going."
Ganguly's 120-ball knock, which included 11 fours and two sixes, guided his side away from a potential banana skin at 24-3.
"Kenya are not the strongest of sides but this is the World
Cup," he said.
"From that point of view it felt very good to
score a hundred."