PORTRUSH, Northern Ireland — Rory McIlroy gave the home crowds exactly what they craved on Saturday: He used the traditional third-round “moving day’’ to make a move up the leaderboard. McIlroy, who began the day at 3-under par, seven shots behind leader Scottie Scheffler, activated the huge Portrush crowds with a third-round 5-under-par 66.

By the time Rory McIlroy finished his first practice round for the British Open at Royal Portrush, a big crowd that weathered rain and sunshine was waiting to see him finish.