Jeev Milkha Singh carded a flawless three-under 67 to be tied 25th while Arjun Atwal's topsy-turvy two-under 68 had him tied 39th after the opening round of the Greenbrier Classic golf tournament in West Virginia, USA.At the top, the American duo of Erik Campton and Matt Every were tied for the lead after carding identical seven-under 67s.