Baltimore Orioles: Primary rival is the New York Yankees (fueled by recent division battles). Their "natural interleague rival" is the neighboring Washington Nationals (The Beltway Series). Boston Red Sox: Their absolute fiercest rival is the New York Yankees, arguably the biggest rivalry in all of sports. They also share a modern divisional grudge with the Tampa Bay Rays and an interleague pairing with the Atlanta Braves. New York Yankees: Major historical rival is the Boston Red Sox. They also maintain intense cross-town friction with the New York Mets (The Subway Series) and recent postseason hostility with the Houston Astros. Tampa Bay Rays: Divisional rivals include the Boston Red Sox and New York Yankees. Their designated in-state interleague rival is the Miami Marlins (The Citrus Series). Toronto Blue Jays: Geographically isolated in Canada, they have a heavy travel-based rivalry with the Seattle Mariners and an historic bad-blood playoff matchup with the Texas Rangers. Their designated interleague rival is the Philadelphia Phillies. Chicago White Sox: Their biggest rival is the cross-town Chicago Cubs (The Crosstown Classic). Within their own division, they clash most heavily with the Minnesota Twins and Detroit Tigers. Cleveland Guardians: Their primary divisional rivals are the Detroit Tigers and the New York Yankees (due to extensive postseason history). Their interleague rival is the Cincinnati Reds (The Ohio Cup). Detroit Tigers: Historically hate the Chicago White Sox and Cleveland Guardians. Their interleague "natural rival" is the Pittsburgh Pirates. Kansas City Royals: Divisional battles with the Cleveland Guardians bring the most heat. Their designated interleague nemesis is the St. Louis Cardinals (The I-70 Series). Minnesota Twins: Strongest division rivalry belongs to the Chicago White Sox. Their interleague counterpart is the regional border foe Milwaukee Brewers. Houston Astros: Their fiercest regional rival is the Texas Rangers (The Lone Star Series). They also share a massive, toxic interleague grudge with the Los Angeles Dodgers stemming from the 2017 World Series fallout. Los Angeles Angels: Primary target is the cross-town Los Angeles Dodgers (The Freeway Series). In-division, they trade blows with the Seattle Mariners and Texas Rangers. Athletics: Historically clashed with the San Francisco Giants (The Bay Bridge Series). In the AL West, they possess tight grudges against the Los Angeles Angels and Houston Astros. Seattle Mariners: They hold structural division rivalries with the Los Angeles Angels and Houston Astros. They have a notable non-division rivalry with the Toronto Blue Jays and a friendly meme-pairing with the San Diego Padres (The Vedder Cup). Texas Rangers: Intrastate warfare with the Houston Astros dominates their schedule. Their designated interleague rival is the Arizona Diamondbacks. Atlanta Braves: Locked in a permanent, brutal three-way battle for the division with the New York Mets and Philadelphia Phillies. Their interleague rival is the Boston Red Sox. Miami Marlins: Primarily compete against the Atlanta Braves and New York Mets. Their geographic interleague rival is the Tampa Bay Rays. New York Mets: Fiercely hate the division-rival Philadelphia Phillies and Atlanta Braves. They also maintain the cross-town Subway Series with the New York Yankees. Philadelphia Phillies: Their most bitter modern and historic enemies are the New York Mets and Atlanta Braves. Their interleague partner is the Toronto Blue Jays. Washington Nationals: Main divisional rivalries are with the Philadelphia Phillies and Atlanta Braves. Their permanent interleague enemy is the Baltimore Orioles. Chicago Cubs: Share an elite, century-old historical rivalry with the St. Louis Cardinals. They also maintain a fierce regional battle with the Milwaukee Brewers (The I-94 Rivalry) and the interleague Chicago White Sox. Cincinnati Reds: Main divisional heat falls on the Pittsburgh Pirates and St. Louis Cardinals. Their designated interleague foe is the Cleveland Guardians. Milwaukee Brewers: Their biggest enemy is the Chicago Cubs, followed closely by the St. Louis Cardinals. Their border battle interleague rival is the Minnesota Twins. Pittsburgh Pirates: Mostly target the Cincinnati Reds and state-rival Philadelphia Phillies. Interleague play maps them to the Detroit Tigers. St. Louis Cardinals: Their ultimate historic nemesis is the Chicago Cubs. They also share high-stakes division history with the Milwaukee Brewers and cross-state interleague friction with the Kansas City Royals.
Arizona Diamondbacks: Share standard divisional friction with the Los Angeles Dodgers and Colorado Rockies. Their permanent interleague partner is the Texas Rangers. Colorado Rockies: Mostly find rivals inside their division with the Arizona Diamondbacks and San Francisco Giants. Their designated interleague partner is the Houston Astros. Los Angeles Dodgers: Their most storied, historic blood-feud is with the San Francisco Giants. Recently, the San Diego Padres have become an incredibly intense division rival. Their interleague rivals are the Los Angeles Angels and the Houston Astros. San Diego Padres: Their main objective is dethroning the Los Angeles Dodgers (The I-5 Series). Their mandated interleague rival is the Seattle Mariners. San Francisco Giants: Bound forever in hatred to the Los Angeles Dodgers dating back to their days in New York. They also maintain the interleague Bay Bridge Series against the Athletics.
