Santiago Casilla is a Dominican former professional baseball relief pitcher. He played in Major League Baseball (MLB) from 2004 to 2018 for the Oakland Athletics and San Francisco Giants. Casilla threw four pitches: a fastball, slider, curveball, and changeup.

The 2012 World Series was the championship series of Major League Baseball's (MLB) 2012 season. The 108th edition of the World Series, the series was a best-of-seven playoff between the National League (NL) champion San Francisco Giants and the American League (AL) champion Detroit Tigers; the Giants won in a four-game sweep. This marked the Giants' seventh World Series title in franchise history, their second in San Francisco, and their second in a three-year period (2010–2012). Their World Series sweep was the first by an NL team since the Cincinnati Reds swept the Oakland Athletics in the 1990 series and the first NL sweep not by the Reds since 1963, when the Los Angeles Dodgers swept the New York Yankees. This was also the first World Series since 1988 to feature both of that year's League MVPs. The Giants' Pablo Sandoval, who in Game 1 tied a record by hitting three home runs in one World Series game — two off Tigers' ace pitcher Justin Verlander — was named the World Series Most Valuable Player (MVP).