Arnold Palmer Invitational runner-up Wyndham Clark seized a 2-shot lead on a challenging opening day at Bay Hill Club and Lodge.

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.