Qualifier Arthur Fery delivered a stunning Australian Open win by beating 20th seed Flavio Cobolli on Sunday.
Marin Cilic had never beaten a Top-5 player on grass in his entire career before Thursday.
Daniil Medvedev quelled the challenge of wildcard Arthur Fery and Marta Kostyuk fought back to upset Maria Sakkari and storm into the Wimbledon second round on a rainy Wednesday.
Seven-time Grand Slam champion Venus Williams and former world number three Elina Svitolina were handed wildcard entries into Wimbledon.
Swiatek is positioned to face American fourth seed Jessica Pegula in the semi-finals.
Ramkumar Ramanathan advanced to the second round of the Wimbledon qualifiers but Prajnesh Gunneswaran, who was under-prepared due to a left-wrist injury, bowed out, in London, on Tuesday.