The 6-foot-10 Young (7-3) won his fourth straight decision over six starts. He and four relievers combined on a five-hitter against the AL West-leading Athletics, who lost for only the fourth time in 17 games.
Young gave up two hits in six innings while striking out six and walking four.
The right-hander has allowed only four earned runs in 38 2/3 innings during his last six starts, lowering his ERA from 4.32 to 2.97.
"I would love to see this guy get the national credit he deserves," said Peavy, who was San Diego's only All-Star last year. "He's been an All-Star for the first half. I hope that doesn't go unnoticed. I know we fly under the radar on a lot of things; I hope this isn't one of them."
While saying it was "extremely nice" that his teammates are pushing him for the honor, Young added: "I think every guy in this clubhouse will take playing in the playoffs, and right now we're playing decent baseball. I think that we can play a little bit better, and we're continuing to improve."
The defending NL West champion Padres leaped over the Los Angeles Dodgers into first place in the division. The Dodgers lost 9-2 at Minnesota.
Hoffman said Young is "definitely a deserving candidate" to be an All-Star.
"He's certainly pitching like one," manager Bruce Bochy said. "That's another great effort. He's really stepped up and done a terrific job."
Young struggled at times against the A's but got out of each jam. He walked the first two batters of the second inning before striking out Jay Payton and getting Jason Kendall to hit into a double play. Marco Scutaro hit a leadoff double in the third and advanced to third with one out before Young retired the next two batters. He issued consecutive walks with one out in the fourth before retiring the side.
"He's got the ability to keep his composure and make pitches when he has to," Bochy said.
"I just felt like in the middle innings I lost my rhythm a little bit," Young said. "I wasn't able to throw the ball exactly where I wanted with the life I wanted, then all of a sudden I got in some jams and I was able to make pitches when I needed to."
Said A's manager Ken Macha: "He puts the fastball up in the zone and it's tough to lay off. Give him some credit. He's been pitching extremely well lately."
Hoffman pitched the ninth for his 19th save in 20 chances. He has 455 career saves, 24 short of Lee Smith's major league record.
Zito (8-4), who went to high school in San Diego, lost for the first time since May 12 at the New York Yankees. His winning streak was over eight starts.
The left-hander went five innings, his second-shortest outing this year. He allowed eight hits and three runs, walked four and struck out three. He also allowed a run on a balk.
The first three Padres reached base in the first, with Mike Cameron scoring when Piazza hit into a double play.
Giles drew a one-out walk in the third and scored on Piazza's double that bounced off the center field fence. Giles drew a leadoff walk in the fifth, reached third with two outs and scored when Zito was called for a balk after he started his motion, then stopped.
"I got a little disoriented for a second," Zito said. "I don't know what happened. I thought maybe I should be in a windup for a second."
- The Padres lead the NL with eight shutouts.
- Oakland SS Bobby Crosby stole a career-high three bases.
- Padres RHP Woody Williams, who got shelled in a rehab start on Monday night at Triple-A Portland, is scheduled to start the second game of a doubleheader Saturday against San Francisco. Williams allowed six runs and eight hits in 2 2/3 innings Monday night, with two walks. He threw 68 pitches in his second rehab start. He's been on the DL since May 13 with a strained left calf.
- Oakland DH Frank Thomas, on the DL with a sprained right quadriceps, did some running and took batting practice.