The American chalks up her recent success to fiancé and coach Bjorn Frantagelo, therapy—and, of course, some world-class shotmaking.

The off-court couples have been maximizing their on-court time together at the combined ATP and WTA 500 event.

The Americans have been an off-court couple since 2017, and have teamed up on court to play the last two US Open mixed doubles events together.

Check out the must-watch teams headlining the co-ed field in Flushing Meadows, including eye-catching team Victoria Azarenka and Thanasi Kokkinakis.

The couple was granted a wild card into the mixed doubles draw at this year's US Open.

It's not how you start, but how you finish, and the 22-year-old Tiafoe finished strong to move past his fellow American, 6-4, 3-6, 6-1, on Sunday.

Travel teaches life lessons, and forces you to learn about others. Forced to stay in one place for the first time in years, the American tennis couple has nonetheless learned plenty about themselves, and each other.

"I think I tried too hard in the first set to impress him," the Serb said after his 7-6 (5), 6-2 win over Bjorn Fratangelo.

Herbert has broken into the Top 40, and he's now trying to win the first singles title of his career.