With Phillies ace Zack Wheeler on the IL with blood clots, what does that mean and how have other pitchers fared?

Saturday night, news dropped that the Phillies were placing ace righty Zack Wheeler on the injured list due to a blood clot in his shoulder area. More on that in a second. Sunday, veteran right-hander Aaron Nola returned from a lengthy stint on the injured list.

Zack Wheeler was placed on the injured list with a blood clot in his “upper extremity” near his throwing shoulder, The Athletic first reported. ESPN added that there is no timetable for his return. Wheeler, 35, pitched Friday night in the Phillies win over the Nationals, going five innings while striking out six and allowing two runs.