The 35-year-old allowed seven earned runs on six hits, three home runs, and two walks in two-thirds of an inning. Jackson is 1-5 with a 12.43 ERA over 25 1/3 innings with Toronto. He's allowed 12 home runs (4.26 HR/9) in that span.
"I think my pitching has just been horseshit, to be honest, since I've been here," he said, according to Gregor Chisholm of The Toronto Star. "That's point blank. The execution has been terrible. I know I'm better than that. That's not who I am."
Jackson entered Monday's game against the Los Angeles Angels in the second inning after Derek Law tossed a scoreless first. He proceeded to allow a home run to Justin Upton with the very first pitch he threw and gave up two more in the inning.
It's a far cry from a year ago when he went 6-3 with a 3.33 ERA over 17 starts with the Oakland Athletics.