Talk about a bummer: Tennis great Serena Williams has canceled her trip to Washington.

The superstar was supposed to visit the White House on Wednesday and play tennis for the Washington Kastles, but she cut her foot last week, leaving her sidelined for the rest of the Kastles' season. Swapping one great player for another, Billie Jean King, who co-founded World TeamTennis (of which the Kastles are part) will hang out with first lady Michelle Obama instead.