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The 1971 Philadelphia International Indoor Open Championships – Men's singles was an event of the 1971 Philadelphia International Indoor Open Championships, tennis tournament played at the Spectrum in Philadelphia, Pennsylvania in the United States from February 9 through February 14, 1971. The draw comprised 32 players and 12 of them were seeded. First-seeded Rod Laver was the defending singles champion. Third-seeded John Newcombe won the title, defeating Laver 7–6, 7–6, 6–4 in the final.