The O's have replaced pitching coach Mark Wiley with former pitching coach and manager Ray Miller. The Baltimore Sun has an article today that explains the situation. The biggest reason for the change:

The Orioles came out of Tuesday's game on pace to walk 778 batters over the full season, which would shatter the 50-year-old club record (688) and challenge the all-time major league record that had only stood since the Philadelphia Athletics walked 827 in 1915.