Webb blew the save Tuesday against the Brewers, giving up two runs on two hits and no walks while striking out one over one inning.
Peterson allowed one run on six hits across 4.1 innings and did not factor into the decision in Tuesday's 4-3, 10-inning loss to the Brewers. He walked three and struck out four.
Bachar will start Wednesday's game against the White Sox, Dominic Campbell of SI.com reports.
The Pirates placed Mattson on the 15-day injured list Tuesday with hip inflammation, retroactive to Sunday.
Ramirez is absent from the lineup for Tuesday's game in Milwaukee.
Happ (knee) will start in left field and bat sixth in Tuesday's game against the Brewers.
Conforto is not in the lineup for Tuesday's contest in Milwaukee.
The Pirates outrighted Bethancourt to Triple-A Indianapolis on Monday.
Ramirez went 1-for-4 with a solo home run in Monday's 4-3 loss to the Brewers.
Crow-Armstrong went 2-for-4 with a solo home run and an additional run scored in Sunday's 4-3 loss to the Brewers. He also stole two bases.
| PITCHING | INN | W | K | HA | ER | BBI | |
| B. Ashcraft | Braxton Ashcraft | 1.6 | 0.04 | 1.4 | 1.4 | 0.7 | 0.5 |
| Relievers | Relievers | 4.0 | 0.13 | 3.1 | 3.7 | 2.0 | 1.7 |
| HITTING | H | R | RBI | TB | BB | SB | |
| R. Simon | Ronny Simon | 0.5 | 0.23 | 0.19 | 0.72 | 0.19 | 0.04 |
| S. Horwitz | Spencer Horwitz | 0.88 | 0.42 | 0.41 | 1.42 | 0.39 | 0.0 |
| B. Reynolds | Bryan Reynolds | 1.06 | 0.42 | 0.57 | 1.85 | 0.33 | 0.05 |
| N. Gonzales | Nick Gonzales | 1.0 | 0.33 | 0.32 | 1.46 | 0.21 | 0.02 |
| A. McCutchen | Andrew McCutchen | 0.79 | 0.4 | 0.32 | 1.4 | 0.42 | 0.02 |
| J. Suwinski | Jack Suwinski | 0.47 | 0.29 | 0.25 | 0.89 | 0.32 | 0.08 |
| J. Triolo | Jared Triolo | 0.47 | 0.23 | 0.2 | 0.73 | 0.24 | 0.05 |
| H. Davis | Henry Davis | 0.47 | 0.25 | 0.21 | 0.69 | 0.23 | 0.0 |
| I. Kiner-Falefa | Isiah Kiner-Falefa | 0.8 | 0.28 | 0.27 | 1.09 | 0.14 | 0.11 |
KEY PLAYER INJURIESNo new major injuries to report NOT PROJECTED TO START:Batting order and lineup confirmed and provided by Rotowire. | |||||||
| PITCHING |
| Braxton Ashcraft |
| Relievers |
| HITTING |
| Ronny Simon |
| Spencer Horwitz |
| Bryan Reynolds |
| Nick Gonzales |
| Andrew McCutchen |
| Jack Suwinski |
| Jared Triolo |
| Henry Davis |
| Isiah Kiner-Falefa |
| INN | W | K | HA | ER | BBI |
| 1.6 | 0.04 | 1.4 | 1.4 | 0.7 | 0.5 |
| 4.0 | 0.13 | 3.1 | 3.7 | 2.0 | 1.7 |
| H | R | RBI | TB | BB | SB |
| 0.5 | 0.23 | 0.19 | 0.72 | 0.19 | 0.04 |
| 0.88 | 0.42 | 0.41 | 1.42 | 0.39 | 0.0 |
| 1.06 | 0.42 | 0.57 | 1.85 | 0.33 | 0.05 |
| 1.0 | 0.33 | 0.32 | 1.46 | 0.21 | 0.02 |
| 0.79 | 0.4 | 0.32 | 1.4 | 0.42 | 0.02 |
| 0.47 | 0.29 | 0.25 | 0.89 | 0.32 | 0.08 |
| 0.47 | 0.23 | 0.2 | 0.73 | 0.24 | 0.05 |
| 0.47 | 0.25 | 0.21 | 0.69 | 0.23 | 0.0 |
| 0.8 | 0.28 | 0.27 | 1.09 | 0.14 | 0.11 |
