On-base plus slugging

On-base plus slugging (OPS)is asabermetricbaseball statisticcalculated as the sum of a player'son-base percentageandslugging percentage.The ability of a player both to get on base and to hit for power, two important offensive skills, are represented. An OPS of.800 or higher inMajor League Baseballputs the player in the upper echelon of hitters. Typically, the league leader in OPS will score near, and sometimes above, the 1.000 mark.

Equation

The basic equation is

$OPS=OBP+SLG\,$

where OBP ison-base percentageand SLG isslugging average.These averages are defined below as:

$OBP={\frac {H+BB+HBP}{AB+BB+SF+HBP}}$

- the numerator "H + BB + HBP" effectively means "number of trips to first base at least"

- the denominator "AB + BB + SF + HBP" effectively means "total plate appearances", but does not include sacrifice bunts

This is because though a batter makes a trip to the plate he is not given an "AB" when he walks (BB or HBP) or when he hits the ball into play and is called out, but the action allows a run to score (SF). As a result, the 4 counts (AB + BB + SF +HBP) are needed to calculate a batter's total trips to the plate.

and

$SLG={\frac {TB}{AB}}$

where:

• H=hits
• BB=bases on balls
• HBP= timeshit by pitch
• AB=at bats
• SF=sacrifice flies
• TB=total bases

In one equation, OPS can be represented as:

$OPS={\frac {AB*(H+BB+HBP)+TB*(AB+BB+SF+HBP)}{AB*(AB+BB+SF+HBP)}}$

History

On-base plus slugging was first popularized in 1984 byJohn ThornandPete Palmer's book,The Hidden Game of Baseball.The New York Timesthen began carrying the leaders in this statistic in its weekly "By the Numbers" box, a feature that continued for four years. Baseball journalistPeter Gammonsused and evangelized the statistic, and other writers and broadcasters picked it up. The popularity of OPS gradually spread, and by 2004 it began appearing onToppsbaseball cards.

OPS was formerly sometimes known asproduction.For instance,productionwas included in early versions of Thorn'sTotal Baseballencyclopedia, and in theStrat-O-Matic Computer Baseballgame. This term has fallen out of use.

OPS gained popularity because of the availability of its components, OBP and SLG, and that team OPS correlates well with team runs scored.

An OPS scale

Bill James,in his essay titled "The 96 Families of Hitters"uses seven different categories for classification by OPS:

Category	Classification	OPS range
A	Great	.9000 and higher
B	Very good	.8334 to.8999
C	Above average	.7667 to.8333
D	Average	.7000 to.7666
E	Below average	.6334 to.6999
F	Poor	.5667 to.6333
G	Very poor	.5666 and lower

This effectively transforms OPS into a seven-point ordinal scale. Substituting quality labels such asexcellent(A),very good(B),good(C),average(D),fair(E),poor(F) andvery poor(G) for the A–G categories creates a subjective reference for OPS values.

Leaders

Further information:List of Major League Baseball career OPS leaders

The top tenMajor League Baseballplayers in lifetime OPS, with at least 3,000 plate appearances as of June 8, 2024,were:

1. Babe Ruth,1.1636
2. Ted Williams,1.1155
3. Lou Gehrig,1.0798
4. Oscar Charleston,1.0632
5. Barry Bonds,1.0512
6. Jimmie Foxx,1.0376
7. Turkey Stearnes,1.0340
8. Mule Suttles,1.0276
9. Hank Greenberg,1.0169
10. Rogers Hornsby,1.0103

The top five were all left-handed batters.Jimmie Foxxhas the highest career OPS for a right-handed batter.

The top ten single-season performances in MLB are (all left-handed hitters):

1. Barry Bonds, 1.4217 (2004)
2. Barry Bonds, 1.3807 (2002)
3. Babe Ruth, 1.3791 (1920)
4. Barry Bonds, 1.3785 (2001)
5. Babe Ruth, 1.3586 (1921)
6. Babe Ruth, 1.3089 (1923)
7. Ted Williams, 1.2875 (1941)
8. Barry Bonds, 1.2778 (2003)
9. Babe Ruth, 1.2582 (1927)
10. Ted Williams, 1.2566 (1957)

The highest single-season mark for a right-handed hitter was 1.2449 byRogers Hornsbyin1925,13th on the all-time list. Since 1935, the highest single-season OPS for a right-hander is 1.2224 byMark McGwirein1998,which was 16th all-time.

Adjusted OPS (OPS+)

OPS+, adjusted OPS, is a closely related statistic. OPS+ is OPS adjusted for the park and the league in which the player played. An OPS+ of 100 is defined to be the league average. An OPS+ of 150 or more is excellent and 125 very good, while an OPS+ of 75 or below is poor.

The basic equation for OPS+ is

$OPS+=100*({\frac {OBP}{*lgOBP}}+{\frac {SLG}{*lgSLG}}-1)$

where *lgOBP is the park adjusted OBP of the league and *lgSLG is the park adjusted SLG of the league.

A common misconception is that OPS+ closely matches the ratio of a player's OPS to that of their league. In fact, due to the additive nature of the two components in OPS+, a player with an OBP and SLG both 50% better than league average in those metrics will have an OPS+ of 200 (twice the league average OPS+) while still having an OPS that is only 50% better than the average OPS of the league. It would be a better (although not exact) approximation to say that a player with an OPS+ of 150 produces 50% moreruns,in a given set of plate appearances, as a player with an OPS+ of 100 (though see clarification above, under "History" ).

Leaders in OPS+

Through the end of the 2019 season, the career top twenty leaders in OPS+ (minimum 3,000 plate appearances) were:

1. Babe Ruth,206
2. Ted Williams,190
3. Barry Bonds,182
4. Lou Gehrig,179
5. Mike Trout,176
6. Rogers Hornsby,175
7. Mickey Mantle,172
8. Dan Brouthers,171
9. Joe Jackson,170
10. Ty Cobb,168
11. Pete Browning,163
11. Jimmie Foxx,163
11. Mark McGwire,163
14. Dave Orr,162
15. Stan Musial,159
16. Hank Greenberg,158
16. Johnny Mize,158
18. Tris Speaker,157
19. Dick Allen,156
19. Willie Mays,156
19. Frank Thomas156

The only purely right-handed batters to appear on this list are Browning, Hornsby, Foxx, Orr, Trout, McGwire, Allen, Mays, and Thomas. Mantle is the only switch-hitter in the group.

The highest single-season performances were:

1. Barry Bonds,268 (2002)
2. Barry Bonds,263 (2004)
3. Barry Bonds,259 (2001)
4. Fred Dunlap,258 (1884) *
5. Babe Ruth,256 (1920)
6. Babe Ruth,239 (1921)
7. Babe Ruth,239 (1923)
8. Ted Williams,235 (1941)
9. Ted Williams,233 (1957)
10. Ross Barnes,231 (1876) **
11. Barry Bonds,231 (2003)

* - Fred Dunlap's historic 1884 season came in theUnion Association,which some baseball experts consider not to be a true major league.

** - Ross Barnes may have been aided by a rule that made a bunt fair if it first rolled in fair territory. He did not play nearly so well when this rule was removed, although injuries may have been mostly to blame, as his fielding statistics similarly declined.

If Dunlap's and Barnes's seasons were to be eliminated from the list, two other Ruth seasons (1926 and 1927) would be on the list. This would also eliminate the only two right-handed batters in the list.

Criticism

Despite its simple calculation, OPS is a controversial measurement. OPS weighs on-base percentage and slugging percentage equally. However, on-base percentage correlates better with scoring runs.Statistics such aswOBAbuild on this distinction usinglinear weights.Additionally, the components of OPS are not typically equal (league-average slugging percentages are usually 75–100 points higher than league-average on-base percentages). As a point of reference, the OPS for all of Major League Baseball in 2019 was.758.

See also

• Sabermetrics
• Gross production average

References

• Thorn, John; Pete Palmer (1984).The Hidden Game of Baseball.Doubleday & Company.ISBN0-385-18283-X.
• Schwarz, Alan(2004).The Numbers Game.Thomas Dunne Books.ISBN0-312-32222-4.