Iga Swiatek admits the strict doping protocols can be stressful for players but feels like she has "been through the worst" after surviving her positive test over contaminated melatonin.
Swiatek said she made far too many mistakes against Keys on Rod Laver Arena and hoped to draw lessons from it.
The Polish second seed was phenomenal on a gusty day at Rod Laver Arena, powering past the eighth seeded-American 6-1, 6-2 in 1hrs 29mins.
Romania's Simona Halep on Friday rounded on the International Tennis Integrity Agency (ITIA) for discrepencies in the treatment of world number two Iga Swiatek after testing positive for a banned substance.
"The player was provisionally suspended from Sept. 22 until Oct. 4, missing three tournaments, which counts towards the sanction, leaving eight days remaining," the ITIA said in a statement.
The 26-year-old jumped above Poland's French Open champion Iga Swiatek thanks to year-end adjustments in the standings.
Top seed Swiatek, who won the title two years ago, showcased her all-court game in a straightforward 6-4, 6-1 win over Russian Liudmila Samsonova to open the evening session at Arthur Ashe Stadium and warned she was only going to improve.
Four-time French Open champion Swiatek was equally dominant as Sinner as the top-seeded Pole eased into the fourth round with a 6-4, 6-2 victory over Russia's Anastasia Pavlyuchenkova.
World number one Iga Swiatek of Poland withdrew from next week's WTA event in Toronto on Friday, citing fatigue from her run to a bronze medal at the Paris Olympics.
Defending champion Iga Swiatek was sent crashing out of the US Open on Sunday, losing in three sets to Latvia's 20th seed Jelena Ostapenko.
The world number 76 came through 7-5, 6-7 (5/7), 6-2 despite being a break down in both of the first two sets against the reigning US Open and French Open champion
Djokovic took a two sets lead over Hubert Hurkacz in their last 16 clash when play was halted ahead of a locally agreed 11pm night-time curfew
Poland's Iga Swiatek continued her dominance on Parisian clay with a third French Open crown in the last four years, defeating unseeded Czech Karolina Muchova 6-2 5-7 6-4 in a thrilling final to capture her fourth Grand Slam title on Saturday.
Reigning French Open champion Iga Swiatek will attempt to become the first woman to successfully defend the title in Paris in 16 years on Saturday when she faces surprise finalist Karolina Muchova.
The top seed will take on Brazil's Beatriz Haddad Maia in the last four as she continues her bid for a third crown in four years at Roland Garros and her fourth Grand Slam title overall
Two-time champion Iga Swiatek targets a place in the French Open quarter-finals on Monday as the war in Ukraine casts a shadow over the Grand Slam showpiece.
Across 57 matches in 17 Grand Slam appearances in her young career, Swiatek has already won 19 sets to love.But she knows how it feels to be on the wrong end of a bagel, having lost three sets at majors 6-0 herself, although all of those came across her first two Slam appearances in 2019 -- one in a match she won against Monica Puig
Swiatek blitzed 80th-ranked Wang Xinyu of China 6-0, 6-0 on the back of 21 winners as the 22-year-old Pole took another step closer to becoming the first woman since Justine Henin in 2007 to win back-to-back titles at Roland Garros.
The big-hitting Belarusian gained revenge for defeat by her Polish rival in the Stuttgart final a fortnight ago with a thrilling triumph to end Swiatek's nine-match winning streak ahead of her French Open defence
