It was an uncharacteristic performance for Shane McClanahan last night against the New York Yankees. It was also one that got cut short by injury. The Tampa Bay Rays' ace gave up five runs in four innings off of home runs by Anthony Volpe and Giancarlo Stanton.After that, Shane McClanahan's night was done thanks to what is being called forearm tightness. That is usually not a good sign.Marc Topkin@TBTimes_RaysUpdated story on #Rays McClanahan, who felt tightness on the outside of his forearm during loss to #Yankees and is flying home Thursday to see team doctor tampabay.com/sports/rays/20…2310Updated story on #Rays McClanahan, who felt tightness on the outside of his forearm during loss to #Yankees and is flying home Thursday to see team doctor tampabay.com/sports/rays/20…For reference, Carlos Rodon of those Yankees missed months of the season with a forearm strain that began in Spring Training. Here's what we know about McClanahan.What happened to Shane McClanahan?Wednesday's start was the fourth for Shane McClanahan since being put on the Injured List. The All-Star starter will hope to avoid another stint, but it doesn't look good.Shane McClanahan suffered an injuryHe said, via ESPN:"It's one of those things where outside of it just kind of got tight and kind of grabbed me a little bit."The ace is headed back to Tampa Bay to see a team doctor to address the issue. As of now, there's no official diagnosis. If it's a grade one strain, he will miss up to one month.Eric Cross@EricCross04Shane Baz, Drew Rasmussen, & Jeffrey Springs already on the IL with major injuries.Shane McClanahan being evaluated for "forearm tightness".Tyler Glasnow on and off the IL constantly.Zach Eflin... pic.twitter.com/kRRaK2hcBh171Shane Baz, Drew Rasmussen, & Jeffrey Springs already on the IL with major injuries.Shane McClanahan being evaluated for "forearm tightness".Tyler Glasnow on and off the IL constantly.Zach Eflin... pic.twitter.com/kRRaK2hcBhA grade two strain will require two months on the Injured List at the minimum. If it happens to be a grade three strain, the Rays won't see McLanahan for a long time. Those take six to nine months to heal.