Second-seeded Ashleigh Barty bounced back to beat Zarina Diyas 1-6, 6-3, 6-2 while No. 3 Kristyna Pliskova fended off Tereza Martincova 7-6 (6), 7-6 (3) in their first round matches at the U.S. Open on Monday. It was Barty’s first match in Arthur Ashe Stadium since winning the doubles title in 2018.

“A bit of a unique feeling, bizarre feeling walking back out onto Arthur Ashe,” she said. “It was really cool. Different to what it felt like during that match.”

Unseeded American Sam Querrey, who made the U.S. Open quarterfinals in 2017, lost in the first round for the second straight year. Argentinian Juan Ignacio Londero beat him 3-6, 6-1, 7-6 (3), 7-5.

Defending champion Novak Djokovic breezed through his opener, defeating Roberto Carballes Baena 6-4, 6-1, 6-4. The top seed will meet Londero in the second round Wednesday.

“Very pleasant conditions,” Djokovic said. “I really like the conditions of the balls, the speed of the court, the weather is fantastic. You know, it’s just very enjoyable.”

American CoCo Vandeweghe, a 2017 semifinalist, went one-and-done for the second straight year. She fell to fellow American No. 20 Sofia Kenin 7-6, 6-3. … Eugenie Bouchard also lost her opener, dropping straight sets 6-3, 6-3 to No. 12 Anastasija Sevastova. … American Jack Sock fell to Uruguay’s Pablo Cuevas 6-4, 7-5, 7-6.