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India won by 6 wickets with Mandhana top scoring with 100 and captain Harmanpreet making an unbeaten 70.
The 38-year-old made his international debut in 2010 in an ODI against Australia.
Sri Lanka have won the three-match series 2-0 after one ended in a tie.
Once skipper Rohit was dismissed by Vandersay, the Indians lost their way.
Richa Ghosh's 96 went in vain as the visitors won by three runs.
Australia got over the line with 21 balls and six wickets to spare with none of the Indian bowlers able to make any impact.
The Kerala batter scored his first international century on Thursday eight years since making his India debut.
In a deciding Super Four contest, the hosts won by 2 wickets.
The pacer will be replaced by 22-year-old Zaman Khan, who has yet to make his ODI debut.
The off-spinner is back in contention for a place in India's World Cup squad.
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