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Sean Manaea
Sean Manaea (born 1992), American left-handed MLB starting pitcher, also 'The Throwin' Samoan'; threw a 2018 Oakland no-hitter, broke out with the 2024 Mets (3.47 ERA), re-signed 3 years/$75M.
Sean Newcomb
Sean Newcomb (born 1993, Brockton, MA), nicknamed Newk, is a left-handed MLB pitcher for the Chicago White Sox; drafted 15th overall in 2014 by the Angels, traded to Atlanta for Andrelton Simmons, career 32-35, 4.03 ERA.
Seattle Mariners
Seattle Mariners, MLB American League West franchise founded 1976, playing since 1999 at T-Mobile Park. Only active MLB team never to reach a World Series; record 116-win 2001 season; six playoff berths.
Seattle Pilots
Seattle Pilots, 1969 American League expansion team at Sicks Stadium; went 64-98 under Joe Schultz, then went bankrupt and became the Milwaukee Brewers in 1970.
SEC Baseball Tournament
The SEC Baseball Tournament is the annual postseason championship of the Southeastern Conference, held since 1998 at Hoover Metropolitan Stadium in Alabama and awarding the SEC's automatic NCAA Tournament bid.
Seiya Suzuki (鈴木 誠也)
Seiya Suzuki (鈴木 誠也), born 1994, is a Japanese right fielder for the Chicago Cubs after nine NPB seasons with the Hiroshima Carp; two-time Central League batting champion, 2020 Olympic gold medalist, and 2025 32-HR, 103-RBI MLB season.
Sergio Romo
Sergio Romo (El Mechon), born 1983 in Brawley, CA, is a former MLB relief pitcher, 2008-2022, who won three World Series with the Giants and struck out Miguel Cabrera to end the 2012 World Series; he retired as a Giant in 2023.
Seth Halvorsen
Seth Halvorsen (born 2000, Chicago) is an American right-handed MLB relief pitcher, drafted three times, Rockies debut 2024, 103.3 mph record fastball, 11 rookie saves in 2025, traded to the Dodgers in 2026.
Seth Hernandez
Seth Hernandez, born 2006 in Pomona, California, is an American pitcher taken sixth overall by the Pittsburgh Pirates in the 2025 draft and the Pirates' top prospect.
Seth Lugo
Seth Lugo (born 1989, Shreveport, LA) is an MLB starting pitcher for the Kansas City Royals, formerly Mets reliever and Padres starter; 2024 AL Cy Young runner-up known for a 3,300-rpm curveball and 10-pitch arsenal.
Seventh-inning stretch
Seventh-inning stretch, a baseball tradition of fans rising and singing during the middle of the seventh inning; origins disputed (1869 Harry Wright letter, 1882 Brother Jasper, 1910 Taft), with "Take Me Out to the Ball Game" popularized by Harry Caray and Bill Veeck in Chicago.
Shane Heams
Shane Heams (Shane Timothy Heams), American pitcher born 1975 in Toledo, Ohio; won baseball gold for the United States at the 2000 Sydney Olympics and spent 1995-2005 in the minor leagues without reaching MLB.
Shane Smith (baseball)
Shane Smith (Shane Jeffrey Smith), born 2000, is a Chicago White Sox right-handed pitcher, first pick of the 2024 Rule 5 Draft from Milwaukee and a 2025 AL All-Star rookie.
Shane Victorino
Shane Victorino, "The Flyin' Hawaiian" (born 1980, Wailuku, HI), former MLB outfielder; 2008 Phillies and 2013 Red Sox World Series champion, four Gold Gloves, two-time All-Star, 231 career steals.
Shay Whitcomb
Shay Whitcomb (Shay Lane Whitcomb) is an MLB infielder/outfielder for the San Francisco Giants, formerly Houston Astros; 2020 fifth-round final pick from UC San Diego who led all minor leaguers with 35 home runs in 2023.
Shea Stadium
Shea Stadium, formally William A. Shea Municipal Stadium, was a multiuse stadium in Flushing Meadows, Queens, that hosted the New York Mets from 1964 to 2008.
Sheila Cornell Douty
Sheila Cornell Douty (Sheila Marie Cornell-Douty), American first baseman, born 1962, won Olympic softball gold at Atlanta 1996 and Sydney 2000, three ISF world titles, four Pan Am golds, 16-time All-American, two halls of fame.
Shelly Stokes
Shelly Stokes (Shelly B. Stokes, born 1967) is an American softball catcher, 1996 Atlanta Olympic gold medalist, 1998 ISF World Champion, and two-time Pan American Games gold medalist; Fresno State graduate, not the Jamaican sprinter Shelly-Ann Fraser-Pryce.
Shibe Park
Shibe Park, later Connie Mack Stadium, was Philadelphia's first steel-reinforced concrete ballpark (1909), home of the Athletics to 1954 and Phillies to 1970, demolished 1976.
Shin-Soo Choo (추신수)
Shin-Soo Choo (추신수), born 1982 in Busan, is a retired South Korean outfielder; 16 MLB seasons (Mariners, Indians, Reds, Rangers) with 218 HR, then four KBO seasons with the SSG Landers, retiring in 2024.
Shoeless Joe (novel)
Shoeless Joe, W. P. Kinsella's 1982 first novel (working title Dream Field), has Iowa farmer Ray Kinsella build a ballpark that summons the ghostly 1919 Black Sox; adapted as Field of Dreams (1989).
Shoeless Joe Jackson
Shoeless Joe Jackson (Joseph Jefferson Jackson, 1887–1951), American MLB outfielder with a .356 career average; banned for life over the 1919 Black Sox fix, acquitted, reinstated by MLB in May 2025.
Shohei Ohtani (大谷 翔平)
Shohei Ohtani (大谷 翔平), born 1994, is a Japanese two-way MLB pitcher and designated hitter for the Dodgers, formerly the Angels and Nippon-Ham Fighters; two-time unanimous AL MVP, 2024 NL MVP, first 50-homer/50-steal season, $700 million contract.
Shortstop
Shortstop: baseball defensive infielder between second and third base, scoring position 6. Most demanding infield position; formalized by Doc Adams around 1845-46, Dickey Pearce made it a fourth infielder.
Shot Heard 'Round the World (baseball)
The Shot Heard 'Round the World, or Miracle of Coogan's Bluff, is Bobby Thomson's 1951 home run that won the New York Giants the National League pennant.
Sidd Finch
Sidd Finch, or Hayden Siddhartha Finch, is a fictional Mets pitching prospect invented by George Plimpton for Sports Illustrated's April 1, 1985 hoax 'The Curious Case of Sidd Finch,' claiming a 168 mph fastball learned in Tibet; SI admitted the joke April 15, 1985.
Sign stealing
Sign stealing: decoding an opposing baseball team's signals, chiefly catcher-to-pitcher pitch signs. Legal by naked eye from the field (runner on second), illegal with electronic devices; the 2017 Houston Astros scandal and PitchCom followed.
Silver Slugger Award
Silver Slugger Award (Hillerich & Bradsby Silver Slugger Award), MLB honor since 1980 for the best offensive player at each position in each league, voted by managers and coaches, trophy a silver-plated Louisville Slugger bat; Bonds leads with 12.
Simeon Woods Richardson
Simeon Woods Richardson (born 2000) is an American right-handed pitcher drafted by the Mets in 2018, traded twice (Stroman, Berríos deals), an Olympic silver medalist, and MLB debutant with the Twins on October 2, 2022.
Simon Mathews (baseball)
Simon Mathews (Simon Ambrose Mathews, born 1995) is an American baseball coach, Washington Nationals MLB pitching coach since November 2025; former Angels minor league pitcher, Georgetown standout, and Cincinnati Reds assistant pitching coach.