HIGHLIGHTS-Tennis-US Open day four

Highlights of the fourth day at the U.S. Open on Wednesday (times GMT):

0009 ​SABALENKA BEATS IATCENKO Defending champion Aryna Sabalenka overpowered Russian Polina Iatcenko, securing a ​6-1 6-1 victory to move into the third round. The ‌world ​number one will face Kamilla Rakhimova from Uzbekistan next.

2135 DE MINAUR WINS Australian sixth seed Alex de Minaur opened his campaign with a 6-2 6-2 6-4 victory over Italian Andrea Guerrieri to advance to the second round.

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2100 JODAR KNOCKED OUT Lucky loser ‌Bu Yunchaokete of China stunned Spanish 12th seed Rafael Jodar 6-2 6-1 6-1, advancing to the second round of a Grand Slam for the first time in his career.

2036 SHELTON ADVANCES American eighth seed Ben Shelton defeated Poland's Hubert Hurkacz 6-3 5-7 7-6(3) 7-5.

2029 MUCHOVA DOMINATES Czech seventh seed Karolina Muchova cruised past Briton Katie Boulter 6-1 6-0 to move on to the next round.

1908 KOSTYUK BEATS STEPHENS Ukrainian 11th seed Marta ⁠Kostyuk defeated ​2017 U.S. Open champion Sloane Stephens 6-1 7-5 ⁠to advance to the third round.

1901 RAIN DELAYS OUTDOOR MATCHES Due to rain, play on the outside courts has been suspended until the weather improves.

1755 RUBLEV KNOCKED OUT Unseeded Spaniard Daniel Merida stunned 23rd seed Andrey ⁠Rublev 6-7(3) 6-2 6-4 6-4, advancing to the third round of a Grand Slam for the first time in his career.

1725 MEDVEDEV ADVANCES Former champion Daniil Medvedev came through a testing third set ​after cruising through the opening two to seal a 6-1 6-3 7-5 victory over American Sebastian Gorzny in just over two hours.

1650 PEGULA DOMINATES Third seed ⁠Jessica Pegula powered into the third round with a 6-3 6-1 victory over fellow American Sofia Kenin, setting up a meeting with Canada's Leylah Fernandez, who beat Thailand's Mananchaya Sawangkaew 6-4 6-1.

1640 SHNAIDER WINS Diana Shnaider held ⁠off ​a second-set fightback from former U.S. Open finalist Karolina Pliskova to seal a 6-1 7-6 (4) win and reach the third round.

1630 PAOLINI THROUGH TO THIRD ROUND Italian 19th seed Jasmine Paolini advanced to the third round with a comfortable 6-4 6-1 victory over compatriot Lucrezia Stefanini.

1600 TOWNSEND ADVANCES American Taylor Townsend made quick work of Australia's Taylah Preston, ⁠earning a 6-1 6-1 victory to become the first player on the day to advance to the third round.

1500 PLAY BEGINS Play began in New York under cloudy ⁠skies, with temperatures around 21 degrees Celsius.

U.S. OPEN ⁠ORDER OF PLAY ON WEDNESDAY (prefix number denotes seeding): ARTHUR ASHE STADIUM (1530 GMT/1130 ET)

3-Jessica Pegula (U.S.) v Sofia Kenin (U.S.) 8-Ben Shelton (U.S.) v Hubert Hurkacz (Poland)

1-Aryna Sabalenka (Belarus) v Polina Iatcenko (Russia) Jaime Faria (Portugal) v 2-Carlos Alcaraz (Spain)

LOUIS ARMSTRONG STADIUM (1500 GMT/1100 ET) 7-Daniil Medvedev (Russia) v Sebastian Gorzny (U.S.)

11-Marta Kostyuk (Ukraine) v Sloane Stephens (U.S.) Rei Sakamoto (Japan) v ‌11-Frances Tiafoe (U.S.)

Lanlana Tararudee (Thailand) v 6-Linda ‌Noskova (Czechia)