US Open champion Sloane Stephens has won her hometown tournament, beating Jelena Ostapenko 7-6 (7-5) 6-1 in the final of the Miami Open.

Seeded 13th, Stephens won with defence, repeatedly extending rallies until Ostapenko would make a mistake.

Ostapenko had a 25-6 advantage in winners but committed 48 unforced errors to 21 by Stephens.

Stephens was the surprise champion at the US Open last September and then endured a long slump she ended at Key Biscayne.

She improved to 6-0 in finals, and will break into the top 10 for first time next week at No. 9.

John Isner tries for the biggest title of his career Sunday when he faces Alexander Zverev in the men’s final.

Isner could give the United States its first sweep at Key Biscayne since 2004 when Andy Roddick and Serena Williams won.