Swiatek’s amazing streak, which goes back to February and has seen her win six tournaments, means it is the longest winning streak of the 21st century.
The two-time French Open champion has thus overtaken Venus Willams’ record set in 2000.
Swiatek, a hot favourite for the SW19 crown, enjoyed the prestigious opening slot on Centre Court usually reserved for the defending champion and beat Croatian Fett 6-0 6-3.
Defending champion Ashleigh Barty’s retirement meant that Swiatek was given the honour of opening play on the main show court.
She looked entirely at home, handing her opponent a 33-minute bagel.
This was the Pole’s first match since winning at Roland Garros and Fett, who has had an active warm-up on the grass, threatened a comeback as she led 3-1 in the second set.
She had three break-points to make it 4-1, but Swiatek escaped and that was the end of it, as the Pole quickly rattled off five games in a row to continue her invincible streak.
Number five seed Maria Sakkari made light work of Australian Zoe Hives, winning 6-1 6-4.
But 14th seed Belinda Bencic is out, losing 4-6 7-5 2-6 to Wang Qiang in a match carried over from Monday.