Rising star Carlos Alcaraz is looking to learn from the best grass-court players, namely Roger Federer and Andy Murray.
Wimbledon champion Elena Rybakina suffered an unexpected early exit from the WTA Bett1Open after she was beaten 6-7 (1) 6-3 6-4 by Croatian Donna Vekic in Berlin.
Five-time Wimbledon singles champion Venus Williams has been awarded a wild card for next month's championships.
Anett Kontaveit has confirmed she will retire from tennis following this year's Wimbledon, despite being only 27 years old.
Nick Kyrgios will miss this week's ATP tournament in Germany due to knee problems, but he remains optimistic about playing at Wimbledon.
Andy Murray continued his excellent preparation for Wimbledon with a second successive title.