Jesse Barfield's three-run homer off Rich Gossage during a five-run eighth inning enabled the Blue Jays to beat the New York Yankees, 7-4, yesterday in Toronto.

With Toronto losing, 4-2, Damaso Garcia led off with a single and reached second on third baseman Graig Nettles's bad throw. Gossage relieved Doyle Alexander and walked Dave Collins.

Willie Upshaw singled home a run. Ernie Whitt hit a high fly ball to shallow right field that scored Collins when second baseman Willie Randolph, center fielder Jerry Mumphrey and right fielder Steve Kemp collided, allowing the ball to fall in for a single. Mumphrey suffered a broken left little toe; the Yankees said he will not go on the disabled list

Barfield, who had dropped a fly ball that allowed two runs in the top of the eighth, then hit his second homer of the season.

"The first time I faced Gossage he blew me away on three pitches. I was really intimidated," said Barfield, who entered the game in the seventh inning as a defensive replacement.

"But now I thrive on the pressure, I couldn't say that in the past."

Roy Lee Jackson, the fourth Toronto pitcher, earned his first victory of the season with 2 1/3 innings of relief. The Yankees left 13 runners on base, prompting Manager Billy Martin to complain, "We had two men on and couldn't score I don't know how many times."