Even though India maintained an all-win record in the pool stage, it was their performance in their last pool game against South Africa which has raised some eyebrows.
The Indians were clinical in their first two wins over Canada (4-0) and England (5-3) but against South Africa they had to slog hard to register a fighting 2-1 victory.
But it should come as a big lesson for the Indian colts ahead of the knockout stages as any slip from here on will dash their hopes of reclaiming the title after a hiatus of 15 years.
"I was surprised with our performance because we didn't play to our potential after the first 15 minutes (against South Africa). I always say that I don't think about opponents, I am always concerned about our own methods," India's head coach Harendra Singh had said after the South Africa game.
"We play simple one-touch hockey and that is what we should play. We just didn't play simple hockey (against South Africa) but the good thing is that it has happened before the knockout stages," he said.
Going by present form, India start as overwhelming favourites against Spain. The Indians have defeated the Spaniards twice in the recent past in a four-nation tournament in Valencia.
The Valencia outing, where India went on to win the title by beating six-time champions and current world junior champions Germany, should give the home team confidence going into tomorrow's all-important encounter at the Major Dhyan Chand Astroturf stadium here.
Although India are expected to win the game hands down, Harendra warned his players against complacency.
"In a World Cup we can't afford to take any team lightly.
We have defeated Spain twice in Valencia but here it is altogether different. Every participating team wants to win the World Cup," Harendra said.
In their last two pool games, India let their momentum slip in phases. Against England they were sloppy in the last 10 minutes and conceded two goals, while against South Africa the Indians faded away after the initial 15 minutes burst.
Excited and pumped up in front of home crowd, the Indians tried too many things and this is something which Harendra would like his wards to avoid tomorrow.