NEW YORK — Sloane Stephens won her first Grand Slam title, routing Madison Keys 6-3, 6-0 in the U.S. Open final.

In the first set, Stephens broke No. 15 Madison Keys’ serve twice and won the set 6-3. Keys hadn’t lost her serve in either of her two previous matches. The unseeded Stephens used her strong defensive skills to keep rallies alive, and Keys lost too many of them while making 17 unforced errors. Stephens committed just two.

Keys and Stephens played in the first all-American U.S. Open final in 15 years. The matchup was the first between Americans at Flushing Meadows since Serena Williams beat her sister Venus in 2002. Both players were competing for their first major title.

Stephens joined Kim Clijsters in 2009 as the only unseeded women to take the U.S. Open title in the Open era, which began in 1968.

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