Defending champion Serena Williams and sister Venus both survived scares to progress at Wimbledon.
Serena beat the world number 65 Christina McHale, 6-7 (7) 6-2 6-4 on Centre Court while Venus won 7-5 4-6 10-8 against teenager Daria Kasatkina.
Serena trailed 2-0 at the start of the deciding set but won in two hours 29 minutes on Centre Court against her fellow American.
The top seed hit 40 unforced errors in the rain-affected match.
Shortly after an interruption while the Centre Court roof was closed because of rain, the world number one had a set point but failed to convert.