KAPALUA, Hawaii—Cameron Smith has a place in the PGA Tour record book for finishing 34-under par, the lowest of anyone in history. Just as important as a number to the unassuming Australian is a name. Over the final two days at the Sentry Tournament of Champions, and particularly the final two hours Sunday at Kapalua, Smith had to hold off Jon Rahm, the No. 1 player in the world. They were never separated by more than two shots over the final 28 holes. Smith had to protect a one-shot lead over the final seven holes, with the Spaniard applying enormous pressure every step of the way. “I felt like I couldn’t miss a shot, otherwise Jon was going to overtake me,” he said. Smith never really did. The final act was a putt from just over 90 feet away on the 18th hole, down a ridge and then picking up …