Ricky Romero's season of soul-searching reached its lowest point here on Wednesday afternoon.

The Jays' 27-year-old ace, who was expected to lead the team's young rotation this year, had his worst outing of the season and among the worst of his career, giving up eight earned runs in just three innings.

He allowed six runs in the first inning alone — a disastrous, 43-pitch opening frame — as the Jays lost 10-4 in front of a sellout crowd of 37,744 at Fenway Park.

"Just a bad day," a sombre Romero said after the game. "I was missing bad. It's disappointing, I'm disappointed in myself."