From the manual:

NOTE 1: If a pitcher is NOT READY (overused, tired, very overused, worn-out) and named as the starting pitcher, the GAME ROBOT WILL NOT use him. Unfortunately our network ROBOT is not yet equipped to catch this problem. The home team will be given a lineup with that pitcher or player in the starting lineup but that lineup will be incorrect as the GAME ROBOT will remove any pitcher or player who is not READY.

To determine who the GAME robot will select to start in this situation, use the following guidelines.

1. If there are one or more starters (pitchers with max-bats of at least 30) who have 30 BFA and are READY, the Game Robot will select the pitcher with the highest PB pitching grade.

2. If there is no READY starter the ROBOT will select a long reliever (with max bats less than 30) with at least 10 BFA.

3. Failing the availability of pitchers designated in one and two above, the GAME ROBOT will select the highest PB rated reliever with either 10 BFA or full BFA.