Collins fired 32 winners and converted six of eight break points while Swiatek, who had won the tournament three times in the last four years, made 22 unforced errors.
Women's top seed Aryna Sabalenka was knocked out in the fourth round of Wimbledon by an inspired Naomi Osaka on Sunday.
Iga Swiatek bulldozed her way to a maiden Wimbledon title on Saturday to take her Grand Slam tally to six
Iga Swiatek survived a surprise U.S. Open second-round test on Thursday as men's top seed Jannik Sinner and Japan's four-times major winner Naomi Osaka cruised through.
Polish world number two Iga Swiatek has been given extra security after a spectator at the Miami Open verbally abused the five-times major champion during a practice session last weekend, the BBC reported on Wednesday.
Coco Gauff was given a solid workout by former champion Sofia Kenin but continued her lengthy winning streak
Elena Rybakina qualified for the WTA Finals' last four, beating an error-prone Iga Swiatek 3-6, 6-1, 6-0 on Monday, while Amanda Anisimova beat fellow American Madison Keys 4-6, 6-3, 6-2 in Riyadh.
Russian Diana Shnaider caused a major upset at the French Open, defeating world number one Aryna Sabalenka in the semi-finals.
Former Wimbledon champion Marketa Vondrousova has been banned for four years after missing a doping test, leading the Professional Tennis Players Association (PTPA) to demand a greater say for athletes in anti-doping regulations. Vondrousova cited safety concerns for not opening her door to a doping control officer late at night, while the International Tennis Integrity Agency (ITIA) maintains that unpredictable testing is crucial for clean sport.
French Open champion Iga Swiatek dropped the lid of the Suzanne Lenglen Cup as she shook the trophy in the air.
Twice champion Iga Swiatek walloped Czech Karolina Muchova in straight sets to reach the Indian Wells quarter-finals on Tuesday.
IMAGES from the Australian Open matches played at Melbourne Park in Melbourne on Thursday.
Jasmine Paolini is the first Italian player to reach the French Open final since doubles partner Sara Errani in 2012.
On Monday, the Polish eighth seed found her grasscourt wings to fly into the Wimbledon quarter-finals with a soaring 6-4, 6-1 victory over Danish 23rd seed Clara Tauson.
Iga Swiatek continued her bid for a fifth French Open title when the Polish fifth seed overcame Romania's Jaqueline Cristian to reach the Roland Garros fourth round.
The world number closed out the victory despite a few service wobbles late on, improving her win-loss record against Rybakina to 8-5.
Maja Chwalinska's incredible run as the first qualifier to reach a French Open final in the professional era marks the fulfilment of an ambition the Polish 24-year-old has chased with relentless passion and discipline for over a decade.
The five-time Grand Slam winner said Pegula was a worthy winner.
The Pole accepted a one-month ban that ended on December 4 after accounting for time already served.
The 23-time Grand Slam champion has become the undisputed headline act at a tournament at which she has won seven singles titles and six doubles crowns with sister Venus.
The WTA has backed players' demands for greater privacy at tournaments after footage of Coco Gauff smashing her racket off court at the Australian Open sparked debate over camera use in player areas.
Madison Keys blasted her way into the Australian Open semi-finals for a third time as the American continues her bid for a first Grand Slam title.
Coco Gauff started her quest for a maiden Australian Open title with a straight games win over Kamilla Rakhimova to reach the second round.
Iga Swiatek cemented her position as the undisputed queen of clay
Images from the US Open women's singles quarter-finals at Flushing Meadows on Wednesday.
Iga Swiatek was thrilled to see Ted Lasso lead Jason Sudeikis in the stands.
Tough road for defending champion Keys
Iga Swiatek tested positive in an out-of-competition sample in August but the ITIA accepted that it was caused by contamination of her medication melatonin.
Defending champion Krejcikova edges Dolehide to move into third round at Wimbledon 2025
Anna Kalinskaya reached her maiden French Open quarterfinal with a 6-4, 2-6, 7-6 (10-7) win over 28th seed Anastasia Potapova on Monday, marking only the second time the Russian has entered that stage of a Grand Slam.
Russia's Mirra Andreeva became the youngest Roland Garros women's singles winner since Monica Seles in 1992, to claim the French Open title and her maiden Grand Slam crown.
World number one Iga Swiatek dominated ninth seed Maria Sakkari to win the Indian Wells final.
Images from Monday's Round of 16 women's singles matches at the US Open.
Novak Djokovic fights past Aleksandar Kovacevic to reach the last 16 at Indian Wells Open, setting up a clash with defending champion Jack Draper.
Elina Svitolina of Ukraine defeated Coco Gauff in the Italian Open final, signalling her ambitions for the upcoming French Open.
Swiatek, the 2022 champion, made her intentions clear early on with an aggressive start to claim a break for a 2-1 lead. She pulled further away when Kostyuk hit a double fault two games later, wrapping up the opening set in 31 minutes.
Elena Rybakina defeated Karolina Muchova to win the Stuttgart Open, securing her second title of the season and driving away with a Porsche car.
Swiatek's dominance on clay that the top seed from Poland has won her last 20 matches at Roland Garros, as she bids for a third successive trophy to add to her maiden Grand Slam triumph in Paris four years ago
Fifth seed Iga Swiatek stages revival to stay in hunt for 4th French crown.
Elena Rybakina defeated Mirra Andreeva to reach the Stuttgart Open final, where she will face Karolina Muchova. Rybakina displayed aggressive play, while Muchova overcame Elina Svitolina in a three-set match.
