Wawrinka's emotional US Open finale ends in defeat to Berrettini

Former champion Stan Wawrinka has lost to Italy's Matteo Berrettini 7-6(4) 7-6(3) 6-0 in the first round of the US Open on Monday, with the 41-year-old Swiss national playing his final Grand Slam tournament before retiring at the end of the season.

In front of a packed crowd on Grandstand, Wawrinka repeatedly threatened to turn the match around before Berrettini, 30, found ways to shut the door, as the pair produced another rollercoaster after their dramatic clash at this year's Wimbledon.

The 2016 champion fell behind early but sparked the crowd into life, breaking to love when Berrettini served for the opening set to pull level.

Wawrinka then earned a set point in a marathon game, but Berrettini survived four deuces to force a tiebreak. The younger player held his nerve again, winning three consecutive points to take the opener.

The second set offered Wawrinka another opening as a brief rain interruption was followed by an early break of Berrettini's serve.

But Wawrinka could not make his advantage count. He had seven break points, including three set points, yet Berrettini repeatedly found a way out before breaking back and forcing another tiebreak, which he won to move within a set of victory.

The third set brought no let-up, with the opening game stretching to 16 minutes after a frustrated Berrettini unsuccessfully challenged a call involving a possible double hit.

Yet Berrettini, former world number six, emerged from the long battle with the first of three breaks to serve up a bagel that ended Wawrinka's glittering Grand Slam career.

"It's been 20 years since the first time I came here. It was amazing for me to feel the New York vibes throughout the years. I found the way to play my best tennis here," Wawrinka said.

Wawrinka's appearance in New York carried added significance after the three-time Grand Slam champion was initially left out of the singles field despite applying for a wildcard.

The decision prompted an outcry from fans, and he was eventually given a place after American Patrick Kypson withdrew with an injury.

Wawrinka, who reached a career-high ranking of world number three, had said before the tournament that he was at peace with his career and simply grateful for one final opportunity at the Grand Slam he won 10 years ago.

"One of the reasons I played until 41 was to live these moments. I'm very grateful for this wildcard. It was very important for me to finish here, where I won a Grand Slam 10 years ago. I want to thank you all for all these years," an emotional Wawrinka added.

Berrettini, a semi-finalist in New York in 2019, will face Mariano Navone in the second round after the Argentine produced the tournament's biggest upset by knocking out fourth seed Novak Djokovic in five sets on Sunday.

Meanwhile, Amanda Anisimova breezed past Ashlyn Krueger 6-1 6-3 in the first round of the U.S. Open on Monday in a strong start for last year's runner-up as she looks to challenge for the title again.

"Today was my birthday, so maybe that took a little bit of the stress off," Anisimova, who turned 25, told reporters after her victory in Flushing Meadows, where the crowd sang her "Happy Birthday."

Anisimova fought off three break points early for a 2-1 lead before running away with the opening set in the all-American matchup at Louis Armstrong Stadium.