Somdev Devvarman survived a scare from wild card Denes Lukacs while Sanam Singh pulled off an upset win over sixth seed Grega Zemlja to make a stupendous start to the ATP Challenger event in Charlottesville in the United States.
Third seed Somdev had to dig deep to prevail over his Hungarian opponent 6-3, 2-6, 7-5 in his opening clash of the USD 50,000 hard court event.
Sanam, who entered the event as a qualifier, claimed the scalp of sixth seed Slovakian with a 6-2, 5-7, 6-4 win in his first-round match.
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Meanwhile, top-seeded pair of Harsh Mankad and Treat Conard Huey suffered a shock first-round defeat at the hands of local wild card duo of Cory Parr and Todd Paul.
The Indo-Philippine pair lost 6-7(1), 5-7 in a tough match.
In the Eckental Challenger event in Germany, Rohan Bopanna and his partner Rameez Junaid, seeded third, went down fighting against Austrian pair of Martin Fischer and Philipp Oswald.
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The Indo-Australian pair lost 5-7, 6-3, 11-13 in their opening round of the euro 30,000 event. They got no point but earned 100 euros each.