India rode on goals from dragflicker Harmanpreet Singh (13th minute, 33rd), Talwinder Singh (21st, 24th), Akashdeep Singh (47th, 59th) and Pradeep Mor (49th) to beat Pakistan 7-1 and zoom to the top of Pool B yesterday.
"I thought Pakistan were the better team in the first quarter and they created more opportunities but after we scored the first goal we started to play according to our plan," said Oltmans after the match.
The 7-1 win was also India's biggest over Pakistan, bettering the 7-4 effort against arch-rivals in 2003 Champions Trophy and 2010 Commonwealth Games.
India will next play The Netherlands tomorrow.