Krejcikova won just her fifth major tournament as a singles player by beating 31st-seeded Anastasia Pavlyuchenkova 6-1, 2-6, 6-4 in the final at Roland Garros.
The four-time major champion and No. 2-ranked player was fined $15,000 when she didn't speak to reporters after her first-round victory at Roland Garros on Sunday.
"Happy to let you know that I will play Geneva and Paris," Federer tweeted, DPA reports. "Until then, I will use the time to train. Can't wait to play in Switzerland again."
"Then I sort of eased my way into it. For me, I think the biggest thing is just having fun and it's the first day having the crowd in a while ... it's always an honour to play her. I just didn't want to go out like really bad, so I just wanted to try my best."
Nagal, India's second-highest ranked men's singles player, lost 2-6, 5-7, 3-6 to Berankis in a match that lasted two hours and six minutes at Court 17.
Tournament was thrown into disarray on Saturday when three people tested positive to Covid-19 on two of the 17 charter flights bringing players and their entourages
Singles, doubles and wheelchair competitions will all be played as usual after agreement was reached to stage the event following eight months of talks between Tennis Australia and state authorities
"Hi everyone, I wanted to let you know that I tested positive for COVID-19. I am self-isolating at home and am recovering well from mild symptoms. I feel good... we will get through this together," Halep wrote on Twitter.
Top seed and 2016 champion Djokovic won 6-4, 6-3, 6-3 against Russian 15th seed Khachanov to draw level with Rafael Nadal on a record 14 quarter-final appearances in Paris
Sebastian Korda, the 20-year-old American qualifier who lost to Rafael Nadal by the above scoreline in the French Open's fourth round Sunday, still was beaming afterward.
