The 37-year-old’s long-term opposition Rafael Nadal is set to take partial in a contest as he seeks to tighten a opening on universe No 1 Novak Djokovic.
The Spaniard will be assimilated by associate large guns Kei Nishikori and Dominic Thiem, ranked seventh and eighth respectively.
NextGen prospects Karen Khachanov and Stefanos Tsitsipas are also set to underline during a Barcelona Open.
Federer, meanwhile, will be fervent to supplement to a 8 Wimbledon titles he has won after this year.
Tennis consultant David Law, though, reckons Djokovic is many expected to secure excellence during SW19.