Wheeler was diagnosed with thoracic outlet syndrome and will require additional surgery that's expected to sideline him for six to eight months.

Philadelphia Phillies right-handed pitcher Zack Wheeler has been diagnosed with venous thoracic outlet syndrome and will undergo surgery in the coming weeks, the team announced today.

The left-hander struck out 12 in 6 1/3 dominant innings Tuesday in a win over the Seattle Mariners. He allowed two runs - one was inherited - and his season ERA is now 2.46, Incredibly, he threw 26 of 27 first-pitch strikes. Sanchez left the field to a standing ovation.