SAN FRANCISCO -- Rookie Mac Williamson hit his first career Major League home run off Boston ace David Price leading off the eighth, a tiebreaking shot into the left-field seats, and the Giants held on to beat the Red Sox, 2-1, on Wednesday night at AT&T Park.
Price had allowed only two hits and three baserunners while outdueling Madison Bumgarner before Williamson homered on the first pitch in the eighth, one of two by the Giants off Price. Brandon Belt had the other, the Giants' first Splash Hit into McCovey Cove since Sept. 25, 2014.
"It was a curve to Belt that I left up," Price said. "I've seen him do a lot of damage on pitches just like that."
Williamson's home run came on a cut fastball that Price had previously struck him out twice with.
"To be able to help the team win, not just get my first home run but have it be a meaningful home run and help the team win, especially at this point in the season, is really special," Williamson said. "He threw some really good pitches to me tonight, so I was just hoping he'd leave it over the plate at some point. I thought I might have got under it a little bit too much, but thankfully the wind threw it out."
Williamson almost let the lead slip away when he dropped Hanley Ramirez's deep fly ball to left for a two-base error leading off the ninth, but Giants manager Bruce Bochy used three relievers to record the final three outs and preserve the win.
"They all did a great job of picking each other up," Bochy said of his bullpen. "We got into a tough jam there with the dropped fly ball. Guys kept their poise and made pitches."
The Giants improved to 13-6 in one-run games.
"Both teams played great defense and both teams pitched well," Red Sox manager John Farrell said. "Timely hitting was the key. The two-out hit was elusive today."
MOMENTS THAT MATTERED
Bumgarner's streak still intact: Bumgarner put together a solid six innings but left with his second no-decision in three starts, the lone mistake being Chris Young's home run on a 3-1 pitch. The good news for the Giants ace is that he didn't take the loss, meaning Bumgarner's career high-tying six-game winning streak is still going.

Not that he was very happy about his night.
"It was just one of those days where you wake up and you know it's going to be a rough one, just the way your body feels," Bumgarner said. "We were able to make pitches when we had to, got away with some mistakes and was fortunate tonight."
Young goes deep: Young hit a two-out, solo home run against Bumgarner in the fourth inning. It was Young's second career homer against Bumgarner and his first homer against a left-hander this year. Young has hit safely in each of his past 14 starts and 16 of his 25 hits have been for extra bases.

"He left a cutter out over the plate on a 3-2 pitch," Young said. "He pitched well. He worked us outside and threw across the plate."
Young added that his first homer against Bumgarner was on a curve.
Give him an extension:Dustin Pedroia singled to lead off the sixth inning, extending his hitting streak to 15 games, the longest active streak in the Majors. Pedroia has hit safely in 26 of his last 28 games.
"This is a great place to play," Farrell said. "We looked forward to coming here. It's a great atmosphere."
Tightening the Belt: The Giants have struggled at the plate for the past week and things didn't get much better against Price. San Francisco managed only two hits through the first seven innings, one of them being Belt's 70th career home run with one out in the fourth. No other player in Bochy's lineup got past first base until Williamson's home run.

QUOTABLE
"I've seen Bumgarner quite a bit. I've had over 20 at-bats against him. That helps. If you're seeing him for the first time, it can be tough. Even if you've seen him a lot, it's still tough." -- Young
WHAT'S NEXT
Red Sox:David Ortiz will return to the starting lineup Friday when the Red Sox open a series at the Twins. Right-hander Steven Wright goes for his fourth straight complete game on the road.
Giants: Right-hander Johnny Cueto takes the mound in the series opener against the Dodgers on Friday at AT&T Park. Cueto can become the first San Francisco pitcher since Rick Reuschel in 1989 to get 10 wins in his first 13 starts of the season.
Watch every out-of-market regular-season game live on MLB.TV.