Otherwise, his first start of the season for the San Francisco Giants was nearly flawless.
Hennessey worked 6 1/3 innings, three relievers combined to finish a three-hit shutout, and the Giants beat the Los Angeles Dodgers 2-0 Sunday night despite another tough game at the plate for Barry Bonds.
Hennessey (1-0) allowed three hits while walking three and striking out two before being relieved by Scott Munter with the bases loaded and one out in the seventh. Munter worked out of trouble by striking out pinch-hitter Ricky Ledee and retiring Dioner Navarro on a fly to right.
"I felt confident in what I was doing, in control of myself. That made it easier," said Hennessey, who found out Saturday he was being recalled from Triple-A Fresno to face the Dodgers.
"He came in and did exactly what anyone would ask for," Giants catcher Mike Matheny said.
Hennessey, a 26-year-old right-hander, was making the 29th start of his career. He was 7-10 with a 4.72 ERA for the Giants in parts of the last two seasons, and 0-1 with a 2.53 ERA in two outings for Fresno earlier this month.
Kent came out of the game after being beaned in the seventh. He was hit on the helmet just behind his left temple on the first pitch from Hennessey with one on and nobody out. Hennessey faced two more batters before being relieved.
"It was a changeup -- I was trying to get ahead," Hennessey said. "It came out of my hand early; my release point got screwed up. You could see with the rest of my pitches that inning -- everything was coming out early."
Kent didn't appear to lose consciousness, but he was wobbly as he got to his feet after being attended to by Dodgers medical personnel. He was assisted to the dugout and replaced by pinch-runner Martinez, and went to Good Samaritan Hospital for a CT scan, which showed that Kent suffered a slight concussion. He reported blurry vision in his left eye and will see an ophthalmologist Monday, according to team spokesman Josh Rawitch.
"Hopefully, he'll be fine," Dodgers manager Grady Little said.
When asked his initial reaction, Little replied: "I was scared to death."
Bonds went hitless in two at-bats, making him 4-for-23 (.174) this season. He also drew his 11th walk and was hit by a pitch leading off the eighth by Tim Hamulack, who was immediately ejected by plate umpire Lance Barksdale.
Bonds declined to speak with reporters afterward.
Giants manager Felipe Alou said he didn't see Bonds get hit but added: "I asked the coaches what happened. They said, 'They drilled Barry.' The umpires believed it, too. Right?"
Hitting coach Jim Lefebvre, who was watching, smiled when asked his opinion.
"It's hard to say," Lefebvre said. "He's got pretty good control. If you've been in the game long enough, you expect those things."
Little said he thought Hamulack shouldn't have been kicked out.
"Any time a guy ejects a pitcher like that, what he's telling everyone is he thought that the pitcher did it purposely when that was not the case," Little said. "Barry hangs out over the plate. One hit him on the pad there."
Hamulack, pitching in his 12th big-league game, said he wasn't throwing at Bonds.
"The catcher set up outside, the ball got away from me," Hamulack said. "But after what happened with Kent, the umpire thought I was doing it purposely."
Booed every time he came to the plate, Bonds flied to center, walked and grounded to first against loser Jae Seo (0-1).
The Giants scored their runs in the sixth with some help from Seo. Omar Vizquel doubled to start the inning, and took third on Mark Sweeney's single. Seo threw two called strikes to Bonds before committing a balk, allowing Vizquel to score and sending Sweeney to second. Sweeney took third on Bonds' grounder, and scored on Ray Durham's two-out single.
Seo was removed for a pinch-hitter after allowing six hits and two runs in six innings.
Vizquel made a smart fielding play in the bottom of the sixth. With one out and runners at first and second, Lofton grounded to second baseman Durham, who flipped to Vizquel for the force. Knowing he couldn't get the relay to first in time for a double play, Vizquel immediately threw to third, where Cody Ross was tagged out after rounding the bag.
Bonds was in the starting lineup for the fourth straight day and the ninth time in the Giants' 11 games this year. He played the first game of a doubleheader Thursday before sitting out the nightcap. ... Dodgers INF Nomar Garciaparra, sidelined with a strained muscle on his right side, took about 70 swings in the batting cage at what Little called 100 percent effort. Garciaparra will take live batting practice Monday. ... Giants INF Lance Niekro didn't start because of soreness in his right foot. Alou said Niekro would be placed on the bereavement list after the game due to the death of his maternal grandfather and will miss at least three more games. ... Giants OF Moises Alou, who has hit three of San Francisco's five homers, returned to the lineup after missing three games with a sore left calf muscle. He was 1-for-3 with a walk.