OPS stands for "On-base Plus Slugging" and is an important statistic used to measure a baseball players offensive performance. It combines two of the most important skills in hitting: getting on base and hitting for extra base hits. OPS is calculated by adding a players on-base percentage (OBP) and slugging percentage (SLG) . OBP measures how often a player reaches base per plate appearance, while SLG measures the total number of bases a player records per at-bat. OPS is meant to combine how well a hitter can reach base with how well he can hit for average and for power.

OPS gained popularity because of the availability of its components, OBP and SLG, and because team OPS correlates well with team runs scored. OPS+ is a closely related statistic that adjusts OPS for the park and the league in which the player played. An OPS+ of 100 is defined to be the league average, and an OPS+ of 150 or more is excellent, while an OPS+ of 75 or below is poor.

OPS is an essential sabermetric statistic that helps to accurately evaluate a players offensive output. It combines the most important elements of baseball offensive play - getting on base safely and hitting for extra base hits - into one easy-to-understand number. OPS is used to compare players across different positions and to track progress from season to season.