Potomac turned back the visiting Buies Creek Astros 4-0 on Friday night in a Carolina League baseball contest. … The Grand Junction Rockies of the Pioneer League opened their season on Friday night with a 9-4 win over the Orem Owlz. Grand Junction is the team Trent Fennell (Triton) was assigned to after being drafted by Colorado out of Barton. Fennell is No. 34 in the rookie league roster. … Dustin Johnson improved to four-under par and maintained the lead in the U.S. Open golf tournament. Tiger Woods, Jordan Spieth and Rory McIlroy were among notables who missed the cut.