J. B. M. Hertzog became 3rd Prime Minister of South Africa. The Democratic National Convention adjourned at midnight with William Gibbs McAdoo and Al Smith deadlocked in balloting.[58] Sixteen-year-old Calvin Coolidge, Jr. played a tennis match on the White House tennis court wearing tennis shoes but no socks. During the course of the match he developed a toe blister that would lead to fatal blood poisoning.[59]