December 11, 1959. The worst Yankees season in 34 years had been over for two months, and the front office finally made its move. The New York Yankees sent Hank Bauer, Don Larsen, Norm Siebern, and Marv Throneberry to the Kansas City Athletics and received a 24-year-old outfielder named , along with Joe DeMaestri and Kent Hadley. Nobody knew it that December afternoon, but the trade would produce two MVP awards, 61 home runs, and the most famous slugging duo in baseball history.
What the Yankees Gave Up
The four players headed to Kansas City told the story of a roster that had run out of time.
Hank Bauer was 35. He'd been a Yankees mainstay since 1948 and hit .323 in the , but his bat had slowed considerably by '59. Don Larsen still had the , but his arm had deteriorated badly -- a 6-7 record with no wins after mid-June told the whole story. Norm Siebern was 26 with some upside, included as a sweetener to get the deal done. Marv Throneberry would later become a cult hero with the '62 Mets (and a genuinely terrible first baseman, which made him lovable in Queens and useless everywhere else).
What the Yankees Got
Maris had hit .273 with 16 home runs and 72 RBI in 122 games for Kansas City in 1959 -- limited numbers partly because he'd missed 45 games after an appendix operation. On the surface, it looked like a reasonable acquisition. Nothing more.
The Yankees' scouts saw deeper. They saw a compact left-handed swing that was tailor-made for the short right-field porch at the Stadium. They saw a 24-year-old with a quick bat, strong arm, and the kind of power that hadn't fully shown up yet in a Kansas City lineup that gave him little protection. Sixteen home runs in 122 games projected to roughly 21 over a full season -- solid, not spectacular. But the projection missed what happens when a hitter like that gets hitting behind him.
The Kansas City Pipeline
The trade didn't happen in a vacuum. The Yankees and Athletics had been executing lopsided deals for years -- a well-known pipeline that sent young talent to New York in exchange for aging veterans. Athletics owner Arnold Johnson had close ties to Yankees ownership, and other AL owners openly complained about the arrangement. Kansas City functioned as something close to a de facto farm club for the Bombers throughout the late 1950s.
This deal followed that pattern but with consequences nobody anticipated. It was the pipeline's masterwork -- the single transaction that justified every complaint the rest of the league had made about the relationship.
The Payoff
Maris didn't just pan out. He and immediately became a different player. He hit .283 with 39 home runs and 112 RBI in his first season in pinstripes, winning the American League MVP Award. The Yankees won the pennant and returned to the World Series (though they lost to Pittsburgh on ).
Then came 1961.
Maris hit , breaking Babe Ruth's single-season record. The "M&M Boys" -- Maris and Mantle -- chased the record together all summer, and the Yankees won 109 games and the World Series. Without the December 1959 trade, none of it happens. No M&M Boys, no 61, no broken record.
| Trade Date | December 11, 1959 |
| Yankees Received | Roger Maris (OF), Joe DeMaestri (INF), Kent Hadley (1B) |
| Yankees Sent | Hank Bauer (OF), Don Larsen (P), Norm Siebern (OF/1B), Marv Throneberry (1B) |
| Maris in KC (1959) | .273 AVG, 16 HR, 72 RBI (122 games) |
| Maris Year 1 (1960) | .283 AVG, 39 HR, 112 RBI, AL MVP |
| Maris Year 2 (1961) | .269 AVG, 61 HR, 142 RBI, AL MVP |
The Bet on Potential
The December 11 date meant Maris didn't play a single game in a Yankees uniform during the 1959 season. The trade was entirely a bet on potential -- the front office acquiring a 24-year-old coming off surgery, sight unseen in pinstripes. His 16 home runs in 122 games didn't scream future MVP. The scouting reports did.
Maris played for the Yankees through 1966, appearing in five consecutive World Series (1960-1964) and winning back-to-back MVP awards. The players sent to Kansas City had minimal subsequent impact -- Bauer became the Athletics' player-manager, Larsen bounced around several teams with diminishing returns, and Throneberry became the most famous bad baseball player in New York history (just for a different team).
The 1959 season had to fall apart for this trade to happen. The failures exposed an aging roster, forced the front office to act, and delivered to a lineup that turned him into something Kansas City never could. The worst Yankees season in a generation produced the single best trade of the next decade.
The Collapse
Yankees go 79-75, their worst record since 1925. The aging roster proves it can't contend without reinforcements.
The Trade
Yankees acquire Roger Maris, Joe DeMaestri, and Kent Hadley from Kansas City for Hank Bauer, Don Larsen, Norm Siebern, and Marv Throneberry.
Immediate Impact
Maris hits .283 with 39 HR and 112 RBI in his first Yankees season, wins the AL MVP, and helps the team return to the World Series.
61
Maris hits his 61st home run off Tracy Stallard, breaking Babe Ruth's single-season record. The trade's ultimate payoff.
Frequently Asked Questions
How did the Yankees get Roger Maris?
The Yankees acquired Roger Maris from the Kansas City Athletics on December 11, 1959, in a seven-player trade. New York sent Hank Bauer, Don Larsen, Norm Siebern, and Marv Throneberry to Kansas City and received Maris, Joe DeMaestri, and Kent Hadley. Maris was 24 years old and had hit .273 with 16 home runs in 122 games for the Athletics.
Who did the Yankees trade for Roger Maris?
The Yankees traded outfielder Hank Bauer, pitcher Don Larsen (famous for his 1956 World Series perfect game), outfielder/first baseman Norm Siebern, and first baseman Marv Throneberry to Kansas City. In return, they received Maris, utility infielder Joe DeMaestri, and first baseman Kent Hadley.
Was the Roger Maris trade part of the Yankees-Kansas City pipeline?
Yes. The Yankees and Athletics executed numerous lopsided trades during the late 1950s, with young talent consistently flowing to New York and aging veterans going to Kansas City. Athletics owner Arnold Johnson had close ties to Yankees ownership, and other AL clubs openly protested the arrangement. The Maris trade was the pipeline's most consequential deal.