There are two history-making, tennis-playing sisters at Chartiers-Houston High in Pennsylvania named Karli and Tanya Timko.

Their mother, Shari, was an All-American gymnast at West Virginia University where their father, Mike, was a quarterback. Their grandfather, Ronnie Retton, was the captain of West Virginia’s 1959 NCAA runner-up basketball team, playing in the same backcourt as Jerry West, and their aunt, Mary Lou Retton, won the gold medal in all-around competiton in gymnastics at the 1984 Olympics.

Their pedigree does not come with added pressure. Instead, it functions as a support system.

“We were at our section tournament and [Mary Lou Retton] was sending us text messages like, ‘You can do it girls, kick some butt!’ ” Karli said. “She was really nice.”

Back to the history. The Timkos are the first girls team to win a WPIAL title in boys’ tennis … and it doesn’t stop there.

The sisters will be looking to put the perfect ending on their fairy-tale story when they attempt to become the first girls to win a PIAA boys’ title in any sport this Friday and Saturday in Hershey.

The girls have already garnered national attention — The Associated Press and national media outlets ran stories when they won the WPIAL Class AA boys’ double title –and could be among the first girls in the country to win a boys’ state high school tennis title.

“From my years of experience, [the girls’ success is] unique,” said Steve Milano, the executive director of the U.S. High School Tennis Coaches Association.