Manager Scott Servais said that he expects Paxton (pectoral) to throw off a mound Friday or Saturday, Greg Johns of MLB.com reports.

EDGE Analysis

Since hitting the disabled list Aug. 10 with a left pectoral strain, Paxton has been limited to playing catch, but the lefty has made enough progress in the last few days to move on to the next phase of the rehab process. Servais said that Paxton and Felix Hernandez (shoulder), who remains on a similar recovery timetable to Paxton, would both throw 20-to-25 pitches in the bullpen session. If Paxton endures no further setbacks along the way, he could be on track to rejoin the Mariners' rotation as soon as mid-September, which would put him in line for about two or three more starts before the end of the regular season.