A total of seven Swedes are in the starting field that kicked off in Houston, USA, on Thursday.
Maja Stark finished the first round at -3 and is tied for fourth. Linnea Ström is in the same position after playing 12 of 18 holes.
Linn Grant is at -2.
Thailand's Patty Tavatanakit and South Korea's Somi Lee share the lead at -5.
Grant did not receive any further training ahead of the first major of the year. She was forced to withdraw from the last competition due to stomach pains, according to Helsingborgs Dagblad.
Grant was diagnosed with endometriosis two years ago. At the LPGA event in North Las Vegas three weeks ago, she was forced to withdraw after one day of play due to stomach pain.
Maja Stark won the US Open last year.
The first round is underway.
