HIGHLIGHTS-Tennis-US Open day four

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

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.

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.

READ MORE Lucky loser Bu sends Jodar out of US Open in rain-affected opener

Ruthless Muchova routs Boulter to reach US Open ‌third round Medvedev, Pegula advance as rain disrupts US Open schedule

Medvedev brushes aside Gorzny after birds ruffle his feathers Pegula sprints past Kenin to reach US ‌Open third round

Zverev soaks up pressure to advance, rain plays spoilsport at US Open Swiatek banks on renewed confidence as Medvedev battles to regain lost form

Teenager Frodin hopes to meet idol Serena after US Open debut 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)