Tennis: Highlights of day one at US Open

Carreno Busta downs former winner Thiem in U.S. Open first round

No avoiding politics as Medvedev returns to Grand Slam stage

Andreescu gives Nike a dressing down at U.S. Open before issuing apology

Ukraine's Snigur stuns former number one Halep in first round

Gauff wins for first time on Ashe to move into U.S. Open second round

Wu ends China's 63-year wait for men's Grand Slam match win

Medvedev whacks aside American Kozlov to begin U.S. Open title defence

As Williams prepares to take U.S. Open court, everyone else a warm-up act

Murray downs error-prone Cerundolo to reach U.S. Open second round

Serena's farewell tour gets top billing on Day One of U.S. Open

Kovinic who? Unknown from Montenegro prepares to send Serena into retirement

Brand Serena will stay strong post-retirement

Williams sisters accept U.S. Open doubles wildcard

U.S. Open readies for Serena Williams retirement party

Nadal's return a boost for depleted U.S. Open men's draw

Nadal, Medvedev lament Djokovic's absence at U.S. Open

Ahead of U.S. Open defence, Raducanu highlights depth of women's field

Medvedev faces plenty of challenges in U.S. Open title defence

List of U.S. Open men's singles champions

List of U.S. Open women's singles champions

U.S. Open order of play on Monday

U.S. Open order of play on Tuesday

0001 KONTAVEIT THROUGH IN 66 MINUTES

Second seed Anett Kontaveit of Estonia cruised into the second round with a 6-3 6-0 win over Jaqueline Cristian in 66 minutes, firing 20 winners past the Romanian while dropping only four points on her first serve.

2235 FORMER CHAMPION THIEM KNOCKED OUT

Austrian Dominic Thiem was knocked out in the first round after 12th seed Pablo Carreno Busta beat the 2020 champion 7-5 6-1 5-7 6-3.

2200 JABEUR, KEYS ADVANCE

Wimbledon finalist and fifth seed Ons Jabeur beat American Madison Brengle 7-5 6-2 to move into the second round.

Brengle's compatriot Madison Keys, however, gave the home crowd reason to cheer after she beat Ukrainian Dayana Yastremska 7-6(3) 6-3.

2002 GAUFF WINS FOR FIRST TIME ON ASHE

American Coco Gauff won her first match at Arthur Ashe Stadium with a 6-2 6-3 victory over France's Leolia Jeanjean.

1956 HALEP UPSET BY UKRAINE'S SNIGUR

Daria Snigur claimed one of the biggest victories of her fledgling career when the 20-year-old beat Simona Halep, 117 rungs above her in the rankings, 6-2 0-6 6-4 in the first round on her Grand Slam main draw debut.

1902 VAN RIJTHOVEN SAVES SEVEN MATCH POINTS TO ADVANCE

Tim van Rijthoven saved seven match points in the third set against China's Zhang Zhizhen to seal an improbable comeback victory, winning 3-6 6-7(4) 7-6(9) 6-1 6-4.

1858 BERRETTINI THROUGH TO SECOND ROUND

Matteo Berrettini beat Nicolas Jarry 6-2 6-3 6-3, becoming the Italian player with the most main draw wins at Flushing Meadows with 13 victories.

1836 WU CHINA'S FIRST WINNER AT GRAND SLAM SINCE 1959

Yibing Wu became the first man from China in 63 years to win a Grand Slam singles match when he beat Nikoloz Basilashvili 6-3 6-4 6-0.

1820 AMERICAN PAUL WINS IN FIRST FIVE-SETTER OF U.S. OPEN

American Tommy Paul came from behind twice to beat Spain's Bernabe Zapata Miralles 4-6 6-3 2-6 6-0 7-5 in what was the first five-setter of the tournament and his first career win at his home Grand Slam.

1815 DEFENDING CHAMP MEDVEDEV EASES PAST KOZLOV

Top seed Daniil Medvedev began his title defence at Arthur Ashe Stadium by crushing American Stefan Kozlov 6-2 6-4 6-0, wrapping up the final set in just 28 minutes.

"I remember in juniors it was impossible to beat him... He destroyed me in the Under-14s. I was happy to get my revenge today," Medvedev said with a laugh.

1754 MURRAY CRUISES THROUGH TO SECOND ROUND

Former champion Andy Murray began his campaign with a 7-5 6-3 6-3 win over Argentine 24th seed Francisco Cerundolo, who made several unforced errors.

"Very tricky conditions, very humid and hot but I was really happy with the way I got through that one," Murray said following his win at Louis Armstrong Stadium.

1706 SAKKARI DOWNS MARIA

Third seed Maria Sakkari overcame a wobble to beat Tatjana Maria 6-4 3-6 6-0 and gain revenge against the German who upset her en route to the Wimbledon semi-finals this year.

Also reaching the second round were Caroline Garcia who beat Kamilla Rakhimova 6-2 6-4 and Veronika Kudermetova after her 7-5 6-3 victory over Donna Vekic.

1505 PLAY UNDERWAY

Play began in sunny New York with the temperature hovering around 28 degree Celsius (82.4 degrees Fahrenheit).

Holder Daniil Medvedev is in action later against American Stefan Kozlov while Coco Gauff takes on Leolia Jeanjean before 23-times major champion Serena Williams meets Danka Kovinic in what is likely to be her final tournament.

(With Reuters inputs)