The Diamondbacks pinch hitters went hitless in 2020. They were 0-22, with three Walks and one HBP. Due to having the DH in the NL last year there was much less need to utilize pinch hitters. But the 26 PH plate appearances were tied with the Pirates for the fewest in the NL. (The Pirates pinch hitters did manage 4 hits though).
Tim Locastro had the most PH PA, with 5, followed by Stephen Vogt, Illdemaro Vargas and Kevin Cron with three each. Nobody else had more than 2 PH PA. 2020 PH Report Link
The less frequent utilization of pinch hitters under Torey Lovullo has been a trend throughout his tenure with Arizona.