Mariners pitcher Taijuan Walker could be done for the season with Vidal Nino set to start Friday for the Mariners, Greg Johns of MLB.com reports. 

While there hasn't been any formal news regarding Walker's status, he's struggled this season - posting a 4.56 ERA and 1.20 WHIP in 169 2/3 innings.

There was a bit of optimism recently surrounding Walker however, as the 23-year-old posted arguably his best line of the season against the Angels Sept. 14, giving up just one run on four hits while striking out seven batters through seven innings, but the Mariners clearly want to give some of their other young arms a chance to start.

Fantasy owners should stay tuned for more information coming in the following days.