India started their World Cup campaign on a winning note, defeating arch-rivals Pakistan by 76 runs at the Adelaide Oval on Sunday.
"It won't be so easy to pick singles. They (South Africa) are much faster, their throwing arm is more powerful and their outfielding ... they cover the area much better than Pakistan," Tendulkar told media.
Considering their sharp fielding, Tendulkar said India need to put up a strong opening partnership and have to be careful while taking quick singles.
Defending champions India clash with one of tournament favourites South Africa in their second game in Melbourne on Sunday.
The former India captain asked the team to watch out for Proteas pace spearhead Steyn. "Without any doubt he's their strike bowler. He's bowled unbelievably well.
"You can't pre-decide how to play Steyn, he could also have a bad day, you have to decide in the moment but you have to respect Steyn, you need to be watchful upfront but take your opportunities," Tendulkar, who has played in a record six World Cups, said.
Tendulkar backed India opener Rohit Sharma to perform after his failure in their win against Pakistan and said opening will be the key for the Men in Blue in their next game against South Africa. He was also not worried about skipper Mahendra Singh Dhoni's form with the bat.

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