Guadalajara, Mexico ? Lorena Ochoa struggled Thursday in the first round in her own Lorena Ochoa Invitational, shooting a 1-over 73 on her home course to drop five strokes behind Annika Sorenstam and the other leaders. LPGA Championship winner Yani Tseng topped the leaderboard at 68 along with Sorenstam, Angela Stanford, Karen Stupples, Seon Hwa Lee, Nicole Castrale, Hee-Won Han and Brittany Lang.