Martin couldn't work out at the combine because of his knee injury, but did bench 225 pounds 23 times. He was hailed as one of the top centers in the draft. He measured in at 6-foot-3, 320 pounds with 34-inch arms and 10-inch hands. On May 9, 2014, the San Francisco 49ers selected him with the No. 6 pick in the third round (No. 70 overall).