Philipp Kohlschreiber was somewhat unfortunate to exit the Stuttgart Open, while Mackenzie McDonald served up a shock in Hertogenbosch.
Anett Kontaveit fell at the first hurdle in Hertogenbosch, but Ashleigh Barty started her grass-court campaign with a routine win.
Rafael Nadal beat Dominic Thiem to win his 11th French title, but could skipping part of the tennis calendar help prolong his career?
After seeing her doping ban extended to 10 months, Sara Errani hinted at retirement.
There was a scare for Naomi Osaka at the Nottingham Open, while Coco Vandeweghe made a winning start at a happy hunting ground.
Seventeen-year-old Rudolf Molleker will face Lucas Pouille in the second round in Stuttgart after claiming his first tour-level win.
Having previously considered skipping the grass-court season, Novak Djokovic has joined an impressive field at Queen's Club as a wildcard.
Rafael Nadal's French Open heroics earned praise from on-court foe Roger Federer, who has his sights on the Spaniard's number one ranking.
The Court of Arbitration for Sport has increased a doping ban handed out to Sara Errani to 10 months, the body confirmed on Monday.
Rafael Nadal constructed another Roland Garros masterclass with Zinedine Zidane present at a venue which is changing fast.