Doug Fister revealed that he underwent an operation this week to remove cancer from the left side of his neck.
Doug Fister's ERA is down to 2.20, which would be the fifth best in baseball if he qualified.
The starter has quietly been arguably the best in the Nationals rotation and has many great peripheral qualities.
The Nationals starter, who took a liner to the head in 2012, likes the progress made in protective cap research but won't don one yet.
The right-handed starter has allowed three runs over his past 14 innings and displayed his all-around talents on Tuesday.
A handful of Nationals pitchers have an opposite pairing of handedness, such as writing left-handed and throwing right-handed.
Left-hander Robbie Ray has made an impact in Detroit in just two starts.
After the Nationals traded for Doug Fister, they attempted to sign him to a contract extension.
Doug Fister will make his Nationals debut Friday, and Scott Hairston will likely come off the DL on Monday.
The Nats may push Doug Fister's debut back to Friday so Stephen Strasburg doesn't get too much rest.