Six weeks into the season, Trevor Cahill was tied for the major-league lead in wins.

Since then, the A's starter is the major-league leader in losses.

On Thursday, Cahill had yet another rickety outing, falling for the seventh time in his past eight decisions. His opposing number, Ricky Ro- mero, recorded his third career shutout as Toronto breezed to a 7-0 win at the Coliseum. Oakland has been shut out a league-high 12 times.

The Blue Jays have won five of their past six and have scored 46 runs in those six games. Romero is on roll with a 0.89 ERA in his past five starts, all victories. He also is on a career-long roll against Oakland, with a 4-0 record and a 1.49 ERA in five starts.

Cahill started the year looking as if he might repeat his All-Star season of 2010; he won his first six decisions and put up a 1.72 ERA. Since then, he is 3-12 with a 5.30 ERA.

"It's frustrating, because I feel like I figure it out over a couple of starts and then go in a funk," Cahill said. "There's no consistency. I'll just try to improve and get some momentum over the next seven or eight starts for next year."