Clay Buchholz is off to a fantastic start this season. How’s he been rewarded? Well, he’s been named American League Pitcher of the Month for April, but he’s also facing some serious allegations up in Toronto.

Broadcaster Dirk Hayhurst, who is also the author of The Bullpen Gospels, took to Twitter on Wednesday night and accused Buchholz of doctoring the baseball. Hayhurst also raised similar questions on SportsNet’s Baseball Central.

Buchholz has been lights-out in the early going this year, and that trend continued on Wednesday, when he blanked the Blue Jays for seven innings en route to his major league-leading sixth win of the season. Hayhurst doesn’t seem to think the success is all natural, though, as he claims to have seen Buchholz load the ball with a substance that was located on the pitcher’s left forearm.

Hayhurst later tweeted a photo, and said, “Looked awfully fishy, is all.”

Buchholz denied any wrongdoing, saying he applied the rosin bag to his arm. Hayhurst is clearly causing quite the stir north of the border, however.

Check out Hayhurst’s allegations in the tweets below.