NEW YORK (AP) — Sloane Stephens never looked shaken by the setting or the stakes in her first Grand Slam final. Her opponent, Madison Keys, most definitely did.

Stephens dominated her close friend Keys 6-3, 6-0 on Saturday to win the U.S. Open, capping a remarkably rapid rise after sitting out 11 months because of foot surgery.

The 83rd-ranked Stephens is only the second unseeded woman to win the tournament in the Open era, which began in 1968.

This was the first all-American women’s final at Flushing Meadows since 2002, when Serena Williams beat Venus Williams.

It was also only the second time in the Open era that two women in New York were making their Grand Slam final debuts against each other. Stephens most certainly handled the occasion better, claiming the last eight games and making only six unforced errors — Keys had 30 — in the…