The 2013 Virtual U.S. Open continues with the Back 9 Challenge played on the closing holes at Merion Golf Club, featuring the winding brook and some difficult greens. Post your best score in this unlimited-play closest-to-the-hole golf challenge. Two players, 1 with the top score and 1 lucky sweepstakes winner, will each receive $500 Gift Cards to USGAshop.com. See rules for details and eligibility.