Fresh off the best season of his career, John Isner is solidifying his style.

Fila has extended its partnership with the American No. 1, who has worn the iconic brand for the last three years.

Watch: Monfils Grounds Goffin in Rotterdam

Financial terms of the deal were not disclosed.

The ninth-ranked Isner has reached a career-high rank and won six titles, including his biggest career championship at the Miami Open last spring.

The 2018 Wimbledon semifinalist qualified for the Nitto ATP Finals in London last fall, the first appearance of his career at the season-ending event.

"My relationship with Fila has been tremendous and I am excited that we are going to continue working together,” said Isner, who is the top seed at this week's New York Open where he will face Bernard Tomic in his opener. "The team at Fila goes to incredible lengths to make sure I have the best apparel and footwear, and that has been instrumental to my performance the last few years."

Photo credit: Fila