Here are the team's records for every season since the Diamondbacks entered the major-leagues in 1998. We also include their Pythagorean record (projected W% based on runs scored and allowed), the number of runs scored and allowed and the average age that season of their hitters (Bat) and pitchers (Pit).,
| Year | W | L | W% | pyth% | Pos | GB | RS | RA | Bat | Pit |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1999 | 100 | 62 | . |