Stacy Prammanasudh shot a 2-under-par 70 to join Grace Par and Cristie Kerr in a tie for second as play was suspended for darkness with one group left to complete their first rounds Friday morning.
Tschetter started on the 10th tee under rainy conditions at the Iron Horse Course at the Vanderbilt Legends Club and hit a 6-iron to 50 feet. Tschetter converted the long birdie try but she found trouble with a bogey at the par-4 11th after her second shot came up short of the green.
The 40-year-old recovered at the par-4 13th and hit a 4-iron to 3 feet for a birdie. Tschetter then hit her third shot to 20 feet and ran home the putt for a birdie at the par-5 14th.
Tschetter struggled with a bogey at the 15th but she knocked her tee shot inside 10 feet for a birdie at the par-3 16th. She gave that shot back at the second, however, when she three-putted for a bogey.
She countered with a birdie at the par-4 sixth and hit a wedge within a foot of the hole for a tap-in birdie at the par-5 seventh.
'I'm quite happy,' said Tschetter, who has undergone multiple hip surgeries. 'I cannot remember playing a course this long.'
Park played the back half first and picked up back-to-back birdies starting at the par-5 14th. Park then birdied the par-4 17th to make the turn at 3 under.
She stumbled to a bogey at the fifth but responded with a birdie at the following hole. Park then bogeyed the ninth to finish within one of Tschetter.
Kerr collected four birdies and two bogeys for her share of second.
Prammanasudh birdied the par-3 third and ran off back-to-back birdies from the par-5 seventh. She then bogeyed the ninth and gave another shot back with a bogey at the 11th.
The 25-year-old countered at the par-4 17th and hit a wedge to 8 feet for a birdie.
'It was tough out there,' said Prammanasudh. 'It played really long because of the wet conditions. Just had to stay patient out there and par was your friend.'
Defending champion Lorena Ochoa posted a 71 to join Wendy Ward, Hee-Won Han, Christina Kim, Sophie Gustafson, Michelle Ellis and Rachel Hetherington in a tie for fifth place.