Chopra completed 54 holes at 16-under-200. The Swede won for the second time on the PGA Tour this year at the Mercedes-Benz Championship.
Second-round leader Bo Van Pelt turned in a 1-over 73 Saturday and dropped into a share of fifth place at 13-under 203 with Kenny Perry (67).
Chopra and Hart were tied for the lead heading to the last hole but Chopra closed with a birdie while Hart had to settle for a bogey.
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