Brittany Altomare erased a three-hole deficit and stunned top-seeded Minjee Lee of Australia 2&1 in the second day of group action at the LPGA Match-Play in Las Vegas.
The result at Shadow Creek Golf Course leaves Altomare and Lee both with 1-1 records heading into their final matches in Group 1 on Friday.
Germany's Caroline Masson tops the group at 2-0 after a 2&1 win over South Korea's Youngin Chun, who fell to 0-2.
The 64-player field is divided into 16 groups of four in a round-robin group stage. The group winners will advance to a 16-player, single-elimination bracket.
In addition to Masson, 10 other players won Thursday for the second day in a row: Hong Kong's Tiffany Chan in Group 2, South Korea's Eun-Hee Ji in Group 4,South Korea's Jenny Shin in Group 6, South Africa's Paula Reto in Group 7, Mexico's Gaby Lopez in Group 8, Spain's Carlota Ciganda in Group 10, Sweden's Madelene Sagstrom in Group 12, South Korea's Hye-Jin Choi in Group 13, LiliaVu in Group 14, and England's Jodi Ewart Shadoff in Group 15.
Antrim woman Stephanie Meadow finished all-square for the second day in a row, this time against Megan Khang.
Meadow had been two up thru 13 but the American levelled with a birdie on the final hole.
Meadow still has a chance to top the group if she beats another American, Andrea Lee, today.