Andy Zhang lost in a playoff at a sectional qualifier in Florida. He was the second alternate when the week began at Olympic Club. Brandt Snedeker also withdrew Monday. Casey pulled out because of a recurring shoulder injury.
Zhang has been part of the IMG Leadbetter Academy in Florida and is based in the Orlando area. Tadd Fujikawa previously was the youngest in the modern era. He was 15 when he qualified for the 2006 U.S. Open at Winged Foot.