Toronto ? Randy Johnson’s first year in New York has not been what he expected, and manager Joe Torre thinks a bad back might be the reason.

Shea Hillenbrand homered, stole home and drove in three runs to lead the Toronto Blue Jays to an 8-5 victory over Johnson and the Yankees on Saturday.

Johnson (11-7) lasted just four innings, allowing six runs – five earned – and 10 hits. The 41-year-old left-hander also gave up six runs in his last start against Anaheim.

“Every year you have a couple of bad games, but this year has been very frustrating,” said Johnson, who has a 4.29 earned-run average. “The lack of consistency, and what I expect every fifth day, has been few and far between.”

It was the second-shortest outing of the season for the five-time Cy Young Award winner, who said he “took it on the chin.”

Torre thinks the Big Unit has a back injury.

“He may be making some adjustments because of the back,” Torre said.

Johnson said his back was fine, but Torre acknowledged the pitcher tweaked it while making a play at first base. Torre said that wasn’t the reason Johnson lasted just four innings, though.

“He felt his back a little bit, but that’s an ongoing situation,” Torre said. “He’s got some physical things to deal with.”

Toronto Blue Jays first baseman Shea Hillenbrand, right, jumps for the throw as New York's Derek Jeter looks back. The Blue Jays beat the Yankees, 8-5, Saturday in Toronto.

Torre, Johnson and catcher John Flaherty all said Johnson’s slider wasn’t effective.

“He’s trying to do too much right now,” Flaherty said. “He wants to turn this thing around. It seems like the harder he tries, the worse his stuff becomes.”

Hillenbrand stole home in the third when Johnson tried to pick off Alex Rios at first. Hillenbrand broke for the plate, and first baseman Jason Giambi threw the ball into Toronto’s dugout, the first of three New York errors.

“It was more or less just an instinct thing,” Hillenbrand said. “Seeing the situation, I just took a gamble. It might be a little bit out of the norm, but every run against Randy is huge.”

Hillenbrand hit an RBI single off Johnson in the first, and his two-run homer off Scott Proctor in the sixth made it 8-4.

Pete Walker (5-3) pitched 2 1/3 innings for the victory.

The Blue Jays also beat Johnson on April 29.

Plate umpire Marty Foster was carted off the field after being struck by a broken bat in the second. Foster appeared to get hit just above his right knee by the barrel of Jason Giambi’s bat. Foster was in obvious pain and remained on the ground for several minutes before being carted off. Laz Diaz moved behind the plate from second base and the game resumed after a delay of about 15 minutes.

“That was ugly,” Torre said.

Rangers 10, Orioles 3

Arlington, Texas – David Dellucci hit a grand slam, Mark Teixeira reached the 30-homer mark for the second straight season, and Texas handed Baltimore its first loss under interim manager Sam Perlozzo. Hank Blalock also homered for Texas, and emergency starter John Wasdin (1-1) gave the Rangers’ rotation a lift, pitching into the seventh inning. Perlozzo had won both games since replacing the fired Lee Mazzilli on Thursday.

Twins 4, Red Sox 3

Minneapolis – Reliever Mike Timlin threw wildly to first base on a sacrifice bunt attempt in the ninth – Boston’s second throwing error in the inning – allowing Minnesota to score the winning run. Michael Cuddyer led off the ninth with an infield single off Timlin (4-2), but third baseman Bill Mueller bounced his throw past first, allowing Cuddyer to move to second. Nick Punto bunted the next pitch back to Timlin, who fired his throw past first baseman Roberto Petagine.

White Sox 4, Mariners 2

Chicago – Mark Buehrle pitched seven strong innings, and Paul Konerko hit a two-run homer, leading Chicago over Seattle. Buehrle (13-4) outpitched Jamie Moyer, scattering seven hits, striking out three and walking none. Dustin Hermanson earned his 27th save in 28 opportunities. Konerko’s 26th homer highlighted Chicago’s three-run first against Moyer.

Indians 4, Tigers 2

Detroit – Jake Westbrook won his fourth straight start, Jhonny Peralta homered, and Grady Sizemore had an RBI triple to lead Cleveland. Westbrook (10-12) allowed four hits – including Magglio Ordonez’s two-run homer – in seven innings. He was dominant early, striking out five of the first seven Detroit batters.

Devil Rays 6, Angels 4

Anaheim, Calif. – Julio Lugo had a pair of RBI singles among his three hits, and Tampa Bay beat Los Angeles. Mark Hendrickson (6-7) allowed four runs and nine hits in five-plus innings after being staked to a 6-1 lead. The 6-foot-9 former NBA player has won consecutive starts for the first time since June of last season.