Yelich became the first MVP to homer in the first three games of the following season, Hader closed things out with an immaculate inning and the Brewers beat the St. Louis Cardinals 4-2 on Saturday night.
After a making a sliding catch in right field for the first out of the game, Yelich got Milwaukee on the board in his first at-bat, sending a hanging slider from Dakota Hudson (0-1) to left for a 1-0 lead.
"He's swinging the bat really good," Brewers manager Craig Counsell said. "Two opposite-field homers in the last two days."
"Those guys are really strong," Hudson said. "A lot of veteran hitters over there. They knew what they could do and they took the ball the backside. It wasn't like they were hitting a ton of mistakes. They knew what they wanted and executed and put a good swing on it."
The right-hander was charged with four runs -- three earned -- seven hits and two walks while striking out six over 4 1/3 innings.
"He competed really well, he went after it," Cardinals manager Mike Shildt said. "I really appreciate the way he dealt with adversity. He went right back at it. So, it's a really good trait. Dakota's going to be more than fine."
Milwaukee right-hander Brandon Woodruff (1-0) held St. Louis to two runs and struck out five over five innings. The Brewers' bullpen took over from there with four scoreless innings, capped by Hader's perfect ninth -- nine pitches, all fastballs, for three strikeouts.
Center fielder Tyler O'Neill was the only player to make contact. He fouled off Hader's first offering before coming up empty on the next two pitches. Hader drew three straight swings and misses from Dexter Fowler and two more after pinch-hitter Yario Munoz looked at strike one.
"It's as good an inning as you can have," Counsell said. "You can't have a better inning than that. He's had a great start to the season."
Including his two-inning, four-strikeout performance on opening day, Hader has thrown 30 pitches, all of them fastballs.
"The way we look at it is, why change something or why try to fix something that's not broken?" Hader said. "We were just trying to attack the zone and continue to read the swings and what we see. That was one of the big things, continuing to attack with our strengths."
YELICH CHASING HISTORY
Yelich is the 35th MLB player and first Brewer to homer in three straight games to start a season.
The major league record for a home run streak to start a year is four games. Five players have accomplished that feat: Willie Mays (1971), Mark McGwire (1998), Nelson Cruz (2011), Chris Davis (2013) and Trevor Story (2016).
WONG STAYS HOT
Cardinals second baseman Kolten Wong recorded his second multihit game Saturday, going 2 for 3 with a double. Through three games, Wong is 6 for 10 with a walk, two home runs and four RBI.
Cardinals: OF Harrison Bader got a day off after going 2 for 8 with a home run through the first two games of the season. With Bader out, Tyler O'Neill made his first start of the season.
Brewers: OF Ryan Braun was left out of the starting lineup but appeared as a pinch-hitter, flying out to left in the sixth.
Cardinals: RHP Michael Wacha is 5-0 with a 4.19 ERA in 11 appearances (10 starts) against Milwaukee, including a 2-0 mark and 3.80 ERA in five appearances (four starts) at Miller Park.
Brewers: RHP Corbin Burnes makes his first major league start Sunday in the series finale. Burns opened eyes as a rookie last season, going 7-0 with a 2.61 ERA in 30 relief appearances then allowing just a pair of runs over nine postseason innings.
More AP MLB: https://apnews.com/MLB and https://twitter.com/AP-Sports
Yu Darvish wondering real reason behind 2017 World Series meltdown
In the aftermath of the Astros' cheating scandal, a big question lingers for former Dodgers pitcher Yu Darvish, who was rocked by Houston during the 2017 World Series: "Was I tipping [pitches], or were they stealing [signs]?"
Red Sox CEO says no notable progress in search; fans back Jason Varitek
While Red Sox CEO Sam Kennedy said no real progress has been made in the team's search for Alex Cora's replacement, fans at the team's winter carnival chanted "Hire Tek!" -- a nod to former captain Jason Varitek.
Astros owner Jim Crane expects to hire new manager by Feb. 3
Houston Astros owner Jim Crane said Friday that he expects to hire a manager to replace AJ Hinch by Feb. 3. Hinch and general manager Jeff Luhnow were fired Monday after both were suspended by Major League Baseball for the team's sign-stealing scandal.
Former Kansas City Royals owner David Glass dies at 84
David Glass, who bought the Kansas City Royals in 2000, died last week at the age of 84, the team announced. Under Glass' ownership, the team reached the World Series in 2014 and won the title in 2015.
Rockies to retire Larry Walker's jersey on April 19
The Rockies will retire Larry Walker's No. 33 jersey on April 19, joining Todd Helton (17) as the only players to be so honored by the team.
Jack McDowell says Tony La Russa had sign-stealing system with White Sox in '80s
Former White Sox pitcher Jack McDowell, who never played for Tony La Russa, said a camera-aided sign-stealing system was set up by the Hall of Fame manager prior to his being fired, and that was used after McDowell made his debut in 1987.