Cubs’ Brad Wieck undergoes Tommy John surgery

Cubs reliever Brad Wieck underwent Tommy John surgery this week. File photo.PHILADELPHIA — When left-hander Brad Wieck first felt the pain in his arm at the start of spring training, he expected he’d be able to avoid Tommy John surgery. But on Friday, the Cubs announced that Wieck had successfully undergone the operation over the All-Star break.

“He’s been through a ton,” Cubs manager David Ross said. “We text back and forth a little bit, and he said everything went well, just got back in Arizona and fixed to start the grind. So I think that says it all; he knows what’s ahead of him.”

The arm injury has delayed Wieck’s return from a second heart operation in the span of two years. Entering…