Jul. 14—From staff reports Derek Berg created some separation from a crowded leaderboard with a pair of eagles Friday for a three-stroke lead after the opening round of the 36th Rosauers Open Invitational. Berg, an instructor at the Pacific Northwest Golf Academy in Issaquah, Washington, eagled the par-5 second hole and closed with another eagle on No. 18. He added four birdies en route to an …