The D.C. was led by stars like Sloane Stephens and Madison Keys, but no seeds made the semifinals and only one (Hsieh) even made the quarters, leaving the event ripe for a new champion, and this victory went to the 79th-ranked Pegula.
Pegula recently began working with David Witt, Venus Williams' former coach.
Pegula, ranked 79th but expected to reach a career-best 54th next week, broke early in each set and closed out matters just inside an hour with an ace. The Italian sprayed a forehand error at the beginning of the second set to suffer another break, wasting a break chance in the next game and finding herself 4-1 down after another break from Jessica who was now marching towards the finish line. Her parents, Terry and Kim Pegula, own the Buffalo Bills and Buffalo Sabres.
"It's been extremely gratifying".
"I'm so happy to win my first tournament here", she said.
The unseeded American was in fine form on a stuffy day in Washington, saving the only break point she faced in the entire match against Giorgi.
After Giorgi fought back to 3-2 in the first set, Pegula took the next three games as the Italian's errors mounted in the 59-minute match. She then obtained a second break after another miscue from Giorgi, polishing off the set with a forehand victor.
At 5-2, Pegula used a strong forehand to force another error and get to double match point, which she converted immediately with a service victor.