WHAT HAPPENED: Laura Siegemund and Mate Pavic had never met each other before the start of the tournament. Now they leave together as US Open mixed doubles champions.

The unseeded duo prevailed in the final on Friday in Arthur Ashe Stadium, defeating No. 7 seeds CoCo Vandeweghe and Rajeev Ram, 6-4, 6-4. All four players were competing for their first Grand Slam title and only Vandeweghe had previously been in a Grand Slam final.

"I can't believe it at this point," said Siegemund. "I was so focused on my job that I wasn't trying to think about the score or where we were. That's why I looked so surprised at the end and couldn't believe it was over. I'm just so happy now."

Although both teams had several break points in the early stages of the match, they continued to hold serve throughout most of the first set. But with Ram serving at 4-4, a volley error from Vandeweghe allowed the German/Croatian pair earn the first break of the match. Siegemund and Pavic needed four set points on Pavic's serve. but made good on their last chance with a booming first serve to close out the set.

The second set opened up with Ram and Pavic both dropping their serve. Pavic continued to put pressure on the American duo with winning reflex volleys, eventually leading his team to a break of Vandeweghe's serve to lead 4-3. The Croat served out the match on his first try as Siegemund covered her mouth in disbelief at winning a Grand Slam title.

WHAT IT MEANS: Pavic and Siegemund had never reached a Grand Slam quarterfinal prior to this tournament. They split $150,000 for their efforts this fortnight.

Vandeweghe is now 0-2 in Grand Slam mixed doubles finals, having lost in the Australian Open this year to Horia Tecau. Ram has been in top form in mixed doubles lately, having clinched a silver medal with Venus Williams at the Rio Olympics. Vandeweghe and Ram split $70,000 as finalists.

THE QUESTION: Do you think Siegemund and Pavic can win more mixed doubles titles in the future?