For the first time in her career, American teenager Coco Gauff lost in the first round of a grand slam.
In her first WTA Tour match since February, Simona Halep was made to work hard for victory by Polona Hercog at the Prague Open.
Kiki Bertens awaits at the Pan Pacific Open for Anastasia Pavlyuchenkova, who was a round-one winner in Osaka.
Katarzyna Kawa threatened to pull off a big upset in the first Baltic Open final, but Anastasija Sevastova roared back to take the title.
Jil Teichmann will have to pull off a big upset to deny world number five Kiki Bertens a third title of the season in Palermo.
A wrist injury hampered Julia Goerges as she exited the Ladies Open Lausanne, but Anastasija Sevastova overcame a scare.
Cori Gauff dispatched Magdalena Rybarikova 6-3 6-3 to move into round three, while Simona Halep and Karolina Pliskova also progressed.
There will be no fourth successive Mallorca Open final for Anastasija Sevastova, who was beaten by Sofia Kenin in the last four on Saturday.
Mallorca Open 2017 champion Anastasija Sevastova cruised into the last eight, while fourth seed Elise Mertens beat Samantha Stosur.
Former Wimbledon champions Angelique Kerber and Maria Sharapova will do battle at the Mallorca Open this week.