Andy Murray and Tim Henman will take part in a charity doubles match this summer to raise funds for the cancer hospital treating Britain's Davis Cup player Ross Hutchins.
The 28-year-old Hutchins was diagnosed with Hodgkins Lymphoma in December and began an expected six months of chemotherapy at the Royal Marsden hospital last month.
'Rally Against Cancer' will take place on finals day at the AEGON Championships at Queen's Club on June 16.
Murray and Henman will be joined by other big-name players and celebrities for the game.
The world No 3 said: "As soon as Ross starting talking about the idea, I knew I wanted to get involved.
"We want to make it a day to remember, so we are talking to a few celebrities who love their tennis about coming down and getting involved."
Ten pounds from each finals day ticket will go to the Royal Marsden Cancer
Charity, while the Lawn Tennis Association will contribute £10 for each ace hit during the tournament and there will also be an auction.
Henman added: "This is a great idea and a great cause, and I'm happy to have been asked to take part."
Donations can be made at www.justgiving.com/RallyAgainstCancer2013 or by texting RALL60 plus the amount pledged (for example "RALL60 #10", to 70070).