There are Major League debuts, and then there is what Joshua Báez did at Wrigley Field.
The St. Louis Cardinals called up one of their most exciting prospects for Saturday's game against the Chicago Cubs, looking for a little energy and right-handed power as they fight to stay in the National League playoff race. Báez responded by producing one of the greatest debuts in baseball history.
Three at-bats. Three home runs. Five RBIs.
Báez became the first player in Major League history to hit three home runs in his MLB debut, turning what was supposed to be the beginning of an evaluation period into an immediate announcement that one of baseball's more explosive young power hitters had arrived.
One Pitch Was All He Needed
Báez was hitting fifth and playing left field when he stepped into the batter's box against Cubs left-hander Matthew Boyd for his first Major League plate appearance. He did not need an adjustment period.
Boyd threw a 93.4 mph fastball on the first pitch Báez ever saw in the Major Leagues. Báez crushed it 449 feet to straightaway center field, with an exit velocity of 108.6 mph, for a two-run home run.
That alone would have made his debut memorable.
Báez was just getting started.
In his second at-bat, he worked the count full before launching a solo home run to left field. Then, in his third trip to the plate, Báez went the other way, driving an 83 mph slider from Boyd over the right-field wall for another two-run shot. The third homer traveled 367 feet and officially put Báez into the record books.
He finally made an out in his fourth at-bat, lining out to left field. His debut line finished at 3-for-4 with three home runs and five RBIs.
For a player who had spent years trying to turn tremendous physical tools into consistent production, it was almost impossible to script a better introduction.
Who Is Joshua Báez?
Báez is not a prospect who suddenly appeared out of nowhere.
The 23-year-old was born in Boston on June 28, 2003, and spent part of his childhood in the Dominican Republic before returning to Boston at age 11. He eventually attended Dexter Southfield School in Massachusetts and developed into one of the most intriguing two-way players in the 2021 draft class. Báez could bring the heat on the mound, touching 99 mph, while also showing enormous raw power as an outfielder. He had committed to Vanderbilt before professional baseball came calling.
St. Louis selected Báez with the 54th overall pick in the second round of the 2021 MLB Draft and signed him for $2.25 million. At 6-foot-3 and approximately 220 pounds, the physical tools immediately stood out.
The question was whether he would make enough contact for all that power to matter.
The Road Wasn't Always Easy
Báez's development is important because he was never a prospect who simply dominated every stop on his way to St. Louis.
Wrist problems slowed him early in his professional career, and his swing-and-miss tendencies became a major concern. In 2024, Báez struck out in 35.5 percent of his plate appearances. For a player with his raw power, that was the difference between being an intriguing athlete and becoming a legitimate Major League prospect.
Then came the breakthrough.
In 2025, Báez simplified his movements at the plate and dramatically improved his contact. His strikeout rate fell to 20.6 percent, an enormous one-year improvement, and the production followed. Between High-A Peoria and Double-A Springfield, he hit .287/.384/.500 with 20 home runs and 54 stolen bases in 117 games.
Yes, 54 stolen bases.
That is what makes Báez especially interesting. This is not simply a big-bodied corner outfielder who can hit the ball a long way. He has legitimate athletic ability, speed and a strong throwing arm. In 2025, Báez and Pirates star prospect Konnor Griffin were the only Minor Leaguers to produce at least 20 home runs and 50 stolen bases.
Suddenly the Cardinals had something much more interesting on their hands.
The Power Exploded in 2026
Báez began 2026 with Triple-A Memphis, and while the swing-and-miss concerns did not completely disappear, the power reached another level.
Over 103 games with Memphis, Báez hit .256 with 34 home runs, 90 RBIs, 21 stolen bases and a .901 OPS. His 34 home runs led all Triple-A hitters at the time of his promotion and were tied for second among all Minor League players.
His complete Triple-A slash line was .256/.328/.573, with 59 extra-base hits and 235 total bases. MLB Pipeline ranked him as the Cardinals' No. 3 prospect and No. 59 overall in baseball entering his promotion.
The numbers were loud, but one night in June showed just how frightening Báez's power can be.
On June 16, Báez hit four home runs and drove in seven runs for Memphis against Nashville. The accomplishment carried an extraordinary emotional component because it happened on the third anniversary of the death of his father, José Manuel, who had helped teach him the game. Báez pointed toward the sky as he rounded the bases during a night that became one of the defining moments of his Minor League career.
Two months later, another unforgettable power performance arrived.
This time it happened at Wrigley Field.
What Kind of Player Can Báez Become?
This is where Báez becomes fascinating from a prospect standpoint.
The power is real. He has shown the ability to produce exit velocities above 110 mph in the Minor Leagues, including a 112.2 mph, 442-foot home run earlier this season. He also brings above-average speed for a player his size and a powerful outfield arm.
There is still risk.
Báez's swing-and-miss rate increased again after moving to Triple-A, and advanced pitching will test him with velocity and breaking pitches outside the strike zone. That will probably determine whether he becomes an occasional power hitter or develops into an everyday middle-of-the-order threat.
But the ceiling is extremely intriguing.
A 6-foot-3, 220-pound outfielder capable of hitting 30-plus home runs while contributing on the bases and possessing enough arm strength for right field is not an ordinary prospect. Báez does not need to hit .300 to become extremely valuable. If he can control the strike zone and keep the strikeouts within a manageable range, the rest of his tools can do plenty of damage.
We received a pretty convincing demonstration on Saturday.
Sportsvival's View
One historic afternoon does not guarantee that Joshua Báez will become a star. Baseball has humbled plenty of players after spectacular debuts, and Major League pitchers will quickly begin searching for holes in his swing.
But this wasn't some light-hitting prospect accidentally running into three pitches.
Báez entered the Major Leagues after leading Triple-A with 34 home runs. He hit 20 homers and stole 54 bases the season before. He has enormous raw power, legitimate athleticism and one of the strongest arms in the Cardinals' system. The ingredients were already there.
Then, in his first Major League game, he took the very first pitch he saw and sent it 449 feet.
Two at-bats later, he had made baseball history.
The Cardinals wanted to find out whether Joshua Báez was ready to become part of their future.
It took him about three swings to make his opening argument.
Joshua Báez is definitely one of the young players Sportsvival will be watching very closely from here.
If not for sports, how would we survive.