Swiatek, the newly-crowned Roland Garros champion, will look to extend her 35-match winning streak when she takes on qualifier Jana Fett at the All England Club.
The eighth-seeded Pliskova didn’t win a single point in the first three games and then double-faulted on break point to hand Barty a 4-0 lead.
Novak Djokovic defeated Swedish player Ymer 6-0, 6-2, 6-3 in just 98 minutes. The most notable feature of the win was the use of drop shots by Djokovic.
World number one Novak Djokovic, who is chasing his fourth US Open title, lost an intense first set that went on for more than an hour.
US Open will take place at the USTA Billie Jean King National Tennis Center from August 31 to September 13 behind closed doors amid the COVID-19 pandemic.
While Karolina Pliskova followed Serena Williams and Naomi Osaka, Angelique Kerber and Simona Halep avoided the exit trend at the ongoing Australian Open.
The world number four beat his Spanish opponent 7-5, 6-1, 6-3 in a two-hour match to enter the third round of Australian Open.
Karolina Pliskova is yet to win a Grand Slam singles title, but she reached the semi-finals in Melbourne last year, falling in three sets to Naomi Osaka.
Elina Svitolina dominated the second set from the word go and broke Karolina Pliskova in the very first game to eventually win first match of WTA Finals.
On Sunday, Williams entered the US Open quarters for the 16th time in her career with a straight-set win over Petra Martic of Croatia at an electric Arthur Ashe Stadium.
