Connor WietgrefePosition: Left-handed pitcherAge: 24Height: 6-foot-2Weight: 200 poundsLevel: Triple-ANotable: Connor Wietgrefe has quietly put himself into position to be knocking at the major-league door. … Since then, the 24-year-old lefty starter has quietly and efficiently ascended the Pirates’ minor-league system, earning promotion to Triple-A Indianapolis in late June. What’s more, he’s actually been better at Triple-A (4-3, 2.61 ERA) than at Double-A (4-1, 3.51). Instead, Wietgrefe utilizes two types of sliders, a cutter and a changeup to complement his four-seamer. As the Pirates navigate injuries and usage concerns to their starting rotation, Wietgrefe could be a dark-horse candidate to help the big-league club.