The Arizona ace credited a solid changeup to help him record a season-high 10 strikeouts. Webb has thrown seven double-digit strikeout games in his career. He limited the Brewers to six hits over his seven innings.
"Mechanically, it was probably as sound as I've been all year," he said. "My arm felt great. The changeup was really good tonight, and I could locate my fastballs. I was jumping ahead of almost every hitter. Overall, it was one of my better games.
"I was throwing [the changeup] for strikes. Getting them to swing at it, getting some strikeouts on it. Most of the time, I felt like I struck them out with a comebacker to the left-handers. If it was an 0-1 pitch, I would go to the changeup a lot there."
Capuano (10-5), an All-Star and former D-Backs southpaw, did not find the same success as he lasted 3 2/3 innings. He was tagged for eight runs, five of which were earned.
"That's a pretty tough customer out there," said Arizona manager Bob Melvin. "Really, from the first inning on, we really made him work and got him out of the game a little bit."
"For a right-handed hitter, he's not a comfortable at-bat," said Conor Jackson. "You don't say that too often about a left-handed pitcher. He hides the ball good."
But he must not have hid the ball too well, as Jackson -- who is not a prototypical power hitter -- hit two solo home runs, one in the third and another in the fourth, snapping a 113-at-bat homerless drought. His last homer prior to Saturday came on May 30 against the Mets.
"I don't consider myself a home run hitter," he said. "I like the gaps. I like the doubles. I was fortunate to get some backspin on a couple."
Jackson has been hitting cleanup of late due to a recent lack of production from the middle of the lineup.
"He's probably going to be a 15-, 18-, 20-[homers-per-year] guy," Melvin said. "It's not something that we put a priority on with him. Whether or not he's really a [No.] 4 guy down the road, we're having a little trouble in the middle, where we're just trying to get good at-bats."
Johnny Estrada -- who was the hero on Friday after he hit a walk-off, two-run shot -- followed Jackson in the fourth with a home run of his own. It was the fourth time this season the D-Backs hit back-to-back jacks.
In his Major League debut, shortstop Stephen Drew went 0-for-3 with a walk and a run scored.
"[He had] good at-bats," Melvin said. "His walk in [the second inning] was big for us. He took a few whacks and pulled the one ball foul over there, stayed out there in the big part of park. Certainly didn't look like it was his first big-league game out there. He's kind of gifted with that poise that we've seen from Day 1 in Spring Training."
With the win, the D-Backs are back to .500 (45-45), and because they were the only team in the National League West to win on Saturday, they now sit three games behind the first-place Padres. Arizona was dwelling in the basement of the division but currently finds itself in fourth place.
Melvin, who does not typically pay attention to the out-of-town scoreboard, couldn't help but notice the NL West's struggles as his team had a comfortable seven-run lead.
"I don't know if it's final over there," he said of the Braves' 11-3 win over the Padres. "It certainly looks like they have it hand, not that I was looking at the scoreboard, which I usually don't.
"I didn't notice that our division lost all across the board," he added with a laugh. "It's going to go back and forth, and as quickly as one team's down, they could be up. All the teams in our division are evenly matched. So this thing's going to go round and round before it's over."