Arnold has been diagnosed with intra-orbital and maxillary sinus fractures after being struck in the left side of the face by a line drive during a start Tuesday at Triple-A Las Vegas, according to Martin Gallegos of MLB.com.
Facing his second batter of the game, Arnold was drilled on the left cheek by a 107 mph line drive. He immediately walked off the mound and into the clubhouse without assistance, but subsequent testing revealed the fractures. Arnold was making just his second start since being promoted to Las Vegas, and he was charged with one run while failing to record an out Tuesday. He will not need surgery, but the left-hander's season is over and it's uncertain beyond that how long his rehab will take. Arnold has collected a 3.50 ERA and 130:52 K:BB over 118.1 innings covering 25 starts this season between Double-A Midland and Las Vegas.