Twenty-five years ago, Brielle Saracini was 10 years old and trying to cope with losing her father, Victor Saracini, the pilot on United flight 175, which was taken over by the 9/11 hijackers and crashed into the South Tower of the World Trade Center. Spurred on by a friend, she wrote a letter to Derek Jeter, met the Yankees captain at Yankee Stadium and formed a lifelong friendship. On Friday, as New York commemorated the 25th anniversary of the terrorist attacks, Saracini threw out the ceremonial first pitch with Jeter watching from the mound before the Yankees hosted the crosstown Mets.