Rory McIlroy again struggled with short putts during the first round of the Arnold Palmer Invitational at Bay Hill, which may prove costly.

After changing golf balls at Pebble Beach, Rory McIlroy has adjusted his wedges, changed his driver and fairway woods and even added a new 3-iron.

He isn't the only major champion to be lurking in the shadows, however. World No. 1 Scottie Scheffler looks sharper by the round and signed for a 71 to put him alongside his Ryder Cup teammates Collin Morikawa, Justin Thomas and Patrick Cantlay.