The Mariners will be without right-hander Tony Zych for four to six weeks due to the rotator cuff tendinitis that landed him on the disabled list earlier this week, reports Bob Dutton of the Tacoma News Tribune. When the Mariners originally announced his injury, Zych had yet to have a followup examination back in Seattle. Those tests have now taken place and produced the timeline for which Seattle will be without its quietly excellent setup man. In 30 1/3 innings since being promoted to the Majors last season, Zych has posted a 2.67 ERA, 12.8 K/9 and 3.3 BB/9 with a 51.5 percent ground-ball rate. He’s also averaged 95.7 mph on his fastball and has the 14th-best K-BB% among MLB pitchers with a minimum of 30 innings thrown dating back to last season.