Lahiri finished with a four-day total of three-over 287 and in tied 25th place and picked up USD 56,000 for his effort at the Royal Melbourne Golf Course here.
His teammate Gaganjeet Bhullar finally came to terms with the Golf Course this week with a round of even par 71 after three irksome rounds on first three days.
Bhullar was 14-over for the week and was 60th and last but still took home USD 20,000.
Home hero Jason Day secured an emotional victory a week after losing eight members of his family in Typhoon Haiyan. He delighted the large crowds including his mother Denning by seeing off Denmark's Thomas Björn by two strokes.
Day's closing round of 70 for a 10-under par aggregate total, allied to his team-mate Adam Scott's seven-under par score, also meant that Australia were crowned World Cup of Golf winners for the fifth time, beating the American team of Matt Kuchar and Kevin Streelman by ten shots.
India finished 26th and last in the team Championships.
"It's a tough test on any day at Royal Melbourne but today was toughest day of the week, wind wise. It really got up, especially on the back nine which was tough to control the ball," said Lahiri.
The 27-year-old Lahiri, a three-time Asian Tour winner, added, "It's been a very good week, a very positive week. My first time out here, a big learning curve on new conditions and very different to what we play on.
"To represent India for the first time as a professional was fantastic. I hope to play in more World Cups as there are a lot of good Indians out there. We have to continue to play a high level of golf to keep myself in the top few to get selected for events like this. I hope there will be many more to come.
"This is what we work towards to, to get to the World Cup and the Majors. I look forward to playing in more events like this," he said.


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