A doctor who bid $70,000 for the right to trade volleys with the tennis legends Andre Agassi and Steffi Graf got an unexpected bonus — offering emergency medical care to Ms. Graf.

Don’t Tell The Donor points out that the donor — a Texas doctor — pledged the money as part of a reality show called The Big Give.

For his bid, he received a tennis lesson with the couple.

But he got much more when Mr. Agassi accidentally hit Ms. Graf in the face with his racket during a volley.

The doctor ended up giving the bloodied Ms. Graf three stitches.

“How funny is it that a doctor was the one who won the auction to play with the superstar couple?” writes Don’t Tell The Donor’s author, who keeps anonymous. “ I guess it would have been funnier if the auction winner was a personal-injury attorney.”

(To learn more about Mr. Agassi’s charitable involvement, read The Chronicle’s profile of him. The article is available to paid subscribers or with the purchase of a short-term pass to our site.)