I just noticed three women with the same last name competing in the San Salivdor Satellite, Anna Maria, Emma and Hilda Zuleta all of Ecuador.

Are they all sisters? and if so is this the first time three siblings have been in a main draw of any type of tennis tournament since the Maleevas or O' Reillys?

anyone know?

yes those 3 are sisters i'm pretty sure

Ana Maria 15/8/83
Hilda 13/9/84
Emma 23/8/85

not sure about the other question,

no its not, they ahve played about half a dozen events together :p