ELK RIVER — Logan O’Brien kept the Alexandria baseball team’s bats quiet in the opening round of the Section 8-4A baseball playoffs for Elk River on Tuesday, May 26. O’Brien threw a complete-game shutout as the third-seeded Elks defeated the sixth-seeded Cardinals 3-0. The loss sends Alexandria into the elimination bracket, as the Cardinals host the St. Cloud Crush at 4:30 p.m. on Thursday, May 28, at Knute Nelson Memorial Park. The Cardinals we…