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South 50
North South 50 (South 50): a 50-lap SSA Super Sedans feature race at Heartland Raceway, Moama, NSW, run over Easter since 2022 with a $10,000 first prize; 2023 winner Steve Jordan, 2022 winner Mick Nicola Jr.
South American Rally Championship
The South American Rally Championship, formally the FIA CODASUR Rally Championship, is an all-gravel FIA regional rally series organized by Codasur and held since 1997.
Southern 100
Southern 100 Road Races: annual July mass-start motorcycle road race meeting on the 4.25-mile Billown Course near Castletown, Isle of Man, first run 14 July 1955; named for its 100-mile 500cc feature race, unlike the TT time-trial format.
Spanish Grand Prix
Spanish Grand Prix: Formula One round first held 1913, championship era from 1951 at Pedralbes; at Circuit de Barcelona-Catalunya since 1991; moves to Madrid's Madring 2026–2035. Records: Schumacher and Hamilton six wins each.
Spanish Rally Championship
The Spanish Rally Championship (Campeonato de España de Rally) is Spain's national rallying series, run by the Real Federación Española de Automovilismo. Since 2021 its flagship title has been the mixed-surface S-CER, alongside the asphalt-only CERA-RECALVI.
Speedway Grand Prix of Poland
Speedway Grand Prix of Poland (Grand Prix Polski na żużlu): Polish rounds of the FIM Speedway Grand Prix world championship. Three rounds per season at venues such as Warsaw's PGE Narodowy, Wrocław, Łódź, Gorzów, and Toruń, including the Toruń finale.
Speedway Grand Prix of Sweden
Speedway Grand Prix of Sweden, the Swedish round of the FIM Speedway Grand Prix world championship, held at Skrotfrag Arena, Målilla since 2005 (missed 2013 and 2020); winners include Jason Crump (5 wins), Brady Kurtz, and Anders Thomsen (2026).
Speedway Grand Prix qualification
Speedway Grand Prix qualification is how riders earn places in the FIM Speedway Grand Prix, the world championship of speedway motorcycle racing, through championship standings, the SGP Challenge, and wild cards.
Speedway in Poland
Speedway in Poland is motorcycle racing on oval dirt tracks, first held in the early 1930s, whose Ekstraliga is the most popular speedway league in the world.
Speedway in the United Kingdom
Speedway in the United Kingdom is British league motorcycle speedway, controlled by British Speedway Promoters Ltd since its 1928 start at High Beech, now declining with five Premiership teams.
Speedway World Championship
The FIM Speedway World Championship is speedway motorcycle racing's world title, a one-day final from 1936 to 1994 and the Speedway Grand Prix series since 1995; record six titles shared by Mauger, Rickardsson, and Zmarzlik, with Robert Lambert the 2026 champion.
Speedway World Cup
FIM Speedway World Cup (SWC), speedway's world team championship, successor to the 1960 World Team Cup, launched 2001, won most by Poland (9 titles), replaced by Speedway of Nations 2018–2022, Australia won 2026 in Warsaw.
Speedway World Under-21 Championship
The Speedway World Under-21 Championship, also known as the FIM Speedway Under-21 World Championship, is the FIM world championship for speedway riders under 21, first held in 1977.
Sports Car Club of America
The Sports Car Club of America (SCCA), founded in 1944, is a not-for-profit American motorsports organization with more than 70,000 members, headquartered in Topeka, Kansas.
Sports car racing
Sports car racing: closed-wheel endurance circuit racing with GT and prototype cars, multi-driver teams, and races up to 24 hours. Anchored by the 24 Hours of Le Mans, FIA WEC and IMSA; Hypercar (LMH/LMDh) top class unified to a single platform from 2030.
Sprint (track cycling)
The sprint, also known as match sprint, is a track cycling event contested at the UCI Track Cycling World Championships since at least 1897, often featuring track stands.
Sprint car racing
Sprint car racing: North American open-wheel dirt-track racing with fenderless, winged (or wingless) single-seat cars; 410 or 360 ci methanol V-8s, ~900 hp, ~1,425 lb minimum; World of Outlaws, High Limit Racing, Knoxville Nationals.
Squirrel McNutt
Squirrel McNutt, real name George Siciliano (also LS George), is an American YouTuber and ARCA stock car driver, Cleetus McFarland's partner, who debuted in ARCA East at Hickory in March 2026.
SRO GT4
SRO GT4: production-based Grand Touring race car category run by SRO Motorsports Group, below GT3 in power, aero and cost; balanced by BoP, RACB-homologated, contested globally via the GT4 Manufacturer Ranking launched 2024 with nine manufacturers in 2026.
St. James Davis
St. James Davis (St. James Harley Davis, 1943-2018), American stock car driver from West Covina, California; NASCAR Winston West Series veteran from 1978 with 136 starts, 3 top-10s; hospitalized critically in 2005.
St. Petersburg Street Circuit
St. Petersburg Street Circuit: temporary 1.8-mile, 14-turn street-airport course in downtown St. Petersburg, Florida, using Albert Whitted Airport runway; hosts the Firestone Grand Prix, the INDYCAR season opener.
Stage 20 of the 1989 Tour de France
The final time trial of the 1989 Tour de France, in which Greg LeMond overtook Laurent Fignon to win by 8 seconds, the closest margin in Tour history.
Stages and classifications of the Tour de France
The stages and classifications of the Tour de France cover its 21 stages, stage types, and the parallel jersey competitions for overall, points, climbing, and young riders.
Stefan Küng
Stefan Küng (born 1993) is a Swiss cyclist riding for Tudor Pro Cycling: 2015 individual pursuit track world champion, two-time European time trial champion, mixed relay world champion 2022 and 2023, and Vuelta time trial stage winner 2024 and 2026.
Stefan Nimke
Stefan Nimke, German track cyclist (born 1978, Hagenow), sprint and 1 km time trial specialist; Olympic gold 2004 team sprint, six world titles, 2009 worlds record 1:00.666, Rio 2016 Paralympic tandem bronze pilot.
Stefan Steinweg
Stefan Steinweg (born 1969 in Dortmund) is a retired German track cyclist who won team pursuit gold at the 1992 Barcelona Olympics and world titles in 1991 and 2000.
Stefano Casiraghi
Stefano Casiraghi (1960-1990), Italian offshore powerboat racer and businessman, second husband of Princess Caroline of Monaco and father of Andrea, Charlotte, and Pierre; reigning Class 1 world champion killed when his Pinot di Pinot catamaran flipped off Monaco in October 1990.
Stefano Domenicali
Stefano Domenicali (born 1965, Imola) is an Italian executive, President and CEO of Formula 1 since 2021, extended through 2029; former Ferrari team principal (2008-2014) and Lamborghini CEO.
Stephen Wooldridge
Stephen Wooldridge (1977-2017), Australian track cyclist; Olympic gold in the 4000 m team pursuit at Athens 2004 and four team pursuit world titles; later a UNSW engineering academic.
Sterling Marlin
Sterling Marlin, American NASCAR Cup Series driver (1976-2009), son of Coo Coo Marlin; won back-to-back Daytona 500s in 1994-95, 10 Cup wins, third in 2001 standings.