Indian survived some anxious moments when they were down to 10 players and their defence came under immense pressure from hosts Malaysia, who were spurred by their vociferous supporters to go for a match-winner when scores were level in the last quarter.
India rode on Rupinder Pal Singh's second penalty corner conversion with two minutes left to secure the victory that ensured them stay ahead of Malaysia in the league standings.
"Down to 10 players in the last quarter, we could only try to force the pace and try to keep up the pressure. Then on a counter toward the end, you get a penalty corner and get the match-winner. That's lucky," said Oltmans.
Rupinder had earlier opened the Indian scoring with a penalty corner conversion in the 12th minute, but Malaysia equalised through Razie Rahim's penalty corner flick six minutes later.
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Rounding off their five outings with four wins and a draw, India topped the round-robin league standings with 13 points and now await the results of the last couple of games tomorrow to find out who they play in the semifinals.
Malaysian coach Steven van Huizen was disappointed to end on the losing side despite his boys giving a fine display.
"I'm certainly not happy with the result, but quite pleased with the way we played this game," van Huizen said.
"The experience of the Indian players to control the ball and the counter-attack to earn the late penalty corner is what won them the day," he said.
The Malaysian coach said he wanted the players not to be disheartened by this loss and to go out to win the last league outing against South Korea tomorrow, who also today secured their place in the semifinal with a narrow 4-3 win against Japan.
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