Both shot a five-under-par 68, as did Paula Creamer, Alison Lee, Haru Nomura, Mika Miyazato and Ashlan Ramsey.
On an eventful day, American Michelle Wie was stung by a bee.
South Korea's Inbee Park, ranked second in the world, withdrew because of back pain after carding an 80, the second-worst round of her LPGA Tour career.
England's Charley Hull and Scotland's Catriona Matthew are among seven players tied for the lead after round one of the Bahamas LPGA Classic.