Santiago tested positive for exogenous Testosterone. He released a statement saying he will not appeal the suspension. The left-hander will miss the rest of the season. It's worth pointing out that Santiago also had a 10-game suspension for foreign-substance use on his glove -- the first to receive the suspension after MLB's crackdown on using substances. He'll not only be out throughout the rest of 2021, and miss part of 2022 as well. 

Santiago just finished up a 10-game suspension for foreign-substance use. Amazingly, the Mariners went 7-3 while playing a man short in his absence.

It was always a longshot that Santiago, the first pitcher to be suspended for using foreign substances, would win this appeal. He'll officially begin serving the 10-game suspension on Friday and can't return to the Mariners' active roster until July 27. They'll play a man short in the meantime. Santiago, 33, leaves behind a 3.33 ERA and 29/10 K/BB ratio in 24 1/3 innings (one start, 11 relief appearances) this season with Seattle.

Santiago was the first player to be subjected to discipline under MLB's expanded rules cracking down on the use of illegal foreign substances. Apparently his glove was inspected in Seattle earlier this week. The saga continues.