idiom

• I did the research on where we should have the company retreat this year and now I’m waiting for a decision from Bill.  The ball is in his court now.

The ball is in your court: It is up to you to make the next decision or step

http://talksportytomeblog.com/sports-metaphors-at-work/sports-metaphors-at-work-the-balls-in-your-court/