“Game Score” is a Bill James invention that assigns a formula-based number to every start by a starting pitcher, based on his innings pitched, runs and hits and walks allowed, and strikeouts racked up, during that particular game. For more detail on the Game Score formula you can check here: Game Score – Wikipedia .
The idea behind Game Score is to have a single number that summarizes the level of “dominance” a starter achieved during his appearance. A Game Score of 100 might be achieved with, say, a complete-game one-hitter with two walks and 17 Ks. In contrast, a zero Game Score might be a one-inning start giving up nine runs on seven hits and three walks with no Ks. After the jump, the highest Opening Day Game Scores achieved for each franchise since 1916.
Team’s First Game of Season, Highest Game Score for Each Franchise Since 1916
Angels: Andy Messersmith (1972) 87
Astros: J.R. Richard (1980) 85
A’s: Eddie Rommel (1926) 86
Blue Jays: Jack Morris (1992) 73
Braves: Tom Glavine (1992) 90
Brewers: Ben Sheets (2007) 82
Cardinals: Bob Gibson (1967) 90
Cubs: Lon Warneke (1934) 96
D’Backs: Randy Johnson (2002) 82
Dodgers: Don Drysdale (1960) and Hideo Nomo (2003) 85 Clayton Kershaw (2013) 86
Giants: Juan Marichal (1966) 87
Indians: Mel Harder (1935) 95
Mariners: Felix Hernandez (2007) 86
Marlins: Kevin Brown (1997) 81
Mets: Dwight Gooden (1993) 82
Nats/Expos: Steve Rogers (1982) 89
Orioles/Browns: Jim Palmer (1975) and Bob Muncrief (1942) 85
Padres: Dick Selma (1969) 83 (this was the first regular season game in Padres history)
Phillies: Chris Short (1968) 89
Pirates: Bob Veale (1965) 95
Rangers: Jon Matlack (1980) 86
Rays: Steve Trachsel (2000) 74
Red Sox: Lefty Grove (1940) 87 (Grove was 40 years old that season)
Reds: Johnny Vander Meer (1943) 91
Rockies: Mike Hampton (2001) 75
Royals: Kevin Appier (1995) 79
Tigers: Schoolboy Rowe (1936) 85
Twins/Senators: Walter Johnson (1926) 111
White Sox: Lefty Williams (1920) 85
Yankees: Ron Guidry (1980) 87