Former top-ranked player Luke Donald is in the field for the British Open at Royal Troon next week following the withdrawal of Jaco van Zyl.

The R&A, which organizes the British Open, made the announcement Wednesday without giving a reason for Van Zyl's withdrawal.

Donald has slipped to No. 83 in the world rankings, having been No. 1 four years ago. He missed the cut the last time Troon staged the Open, in 2004.

Three Americans are next on the reserve list, headed by Daniel Summerhays.

The British Open starts July 14.