Tucker, who replaced the injured Alou in right field, hit his first career grand slam with two outs in the eighth inning to lift San Francisco over the Colorado Rockies 4-2 Saturday.
"You're making good swings and not getting the results you want, so to come through in the bottom of the eighth to help win a game, it ranks right up there," Tucker said after the Giants rallied late against the Rockies for the second straight game. "It's good to help this team win, especially with two of our big guys out. We're getting chances to drive in runs. It's a matter of coming through."
Alou went on the 15-day disabled list Friday with a right calf strain, similar to the injury that sidelined him during the 2000, '01 and '02 seasons.
Wright gave up a first-inning single to J.T. Snow and then did not allow another hit until Marquis Grissom singled to open the seventh inning. Wright took a three-hitter into the eighth. It was his longest outing since throwing a shutout against the Detroit Tigers on Sept. 13, 2003, with the Kansas City Royals.
"I hope this sets a tone for the starters and gets us back on track," Wright said. "I think we're going to be fine. When we're missing, we're missing in the worst spot."
Wright was removed after Omar Vizquel singled with one out. Brian Fuentes retired Snow, but Scott Dohmann (0-1) relieved and gave up a single to Pedro Feliz and a walk to Edgardo Alfonzo to load the bases.
Tucker hit Dohmann's first pitch over the right-field wall into McCovey Cove, ending a 1-for-12 slump.
"He had just walked Fonzie so I anticipated him getting ahead," Tucker said. "I knew I hit it hard. I just worried if it would go foul."
Dohmann also allowed a game-winning three-run homer to Grissom on Friday night.
"Jamey threw a gem today, an unbelievable game," Dohmann said. "To blow it that late doesn't sit well with me."
Wright allowed one run on three hits in 7 1/3 innings. He struck out three and walked four.
Williams was nearly as spectacular, allowing one run and five hits over seven innings. He struck out five, walked one and retired 10 in a row at one point.
"I felt strong and my job was to limit them to the one run," Williams said. "I knew my dad was listening on the radio. He's with me even when he's home. It's emotional for me because I think about him a lot."
Williams missed part of spring training to visit with his seriously ill father in Hawaii.
The Rockies ran themselves out of another scoring opportunity in the sixth. Wright opened the inning with a single and Aaron Miles sacrificed him to second. With two outs, Todd Helton was walked intentionally. Preston Wilson beat out an infield hit to third base but rounded the bag toward second and was tagged out by Snow for the third out.
"Who would have thought Alfonzo would glove that," Rockies manager Clint Hurdle said. "I think (Wilson) got caught trying for another base. That was a big time play by Alfonzo."
The Giants had runners on second and third with one out in the first but Feliz grounded out to third baseman Gonzalez and Alfonzo grounded out to short.
San Francisco also stranded two runners in the third. Vizquel and Snow received consecutive walks but neither Feliz or Alfonzo could get the ball out of the infield.
Wilson had a sacrifice fly in the ninth to make it 4-2.
- Rockies LHP Bobby Seay was added to the roster before the game. RHP Allan Simpson was optioned to Colorado Springs after Friday night's game to make room for Seay, then was traded Saturday to Houston for right-hander Jose Acevedo.
- Colorado LHP Joe Kennedy makes his 101st career start on Sunday.
- Vizquel needs two more games for ninth all time at that position. Bill Dahlen played 2,132 games there.
- Stanford center Brooke Smith was among the 37,993 in attendance.