Barnhart had a solid showing Tuesday night, going 1-for-3 with a double and RBI. He's started Cincinnati's last three games, so they'll give him the night off and put Ramon Cabrera behind the plate.
He began the rehab assignment on Aug. 12, and likely won't rejoin the Pirates until rosters expand in September, at which point he might get one start per week for the big league club. Stewart is 2-for-14 with five walks in six games with Altoona.
The catcher hit a pair of doubles Tuesday to push his average back up above the Mendoza Line. After a lackluster first half in which he played the backup role to Jonathan Lucroy, Maldonado has shown improvement in recent weeks since getting the starting gig after Lucroy was traded. He's already got more at-bats post All-Star break (69) than he did prior to the Midsummer Classic (66), and Maldonado's .261 second-half batting average is greatly improved from the .152 he posted in the first half of 2016.
Considered one of the better hitting prospects in the Colorado organization heading into this season, Nunez has had a rather down year in the hitter-friendly confines on the California League. His average is down, his strikeouts are up, and he has not quite shown the same power as a season ago. Still, he has above-average plate discipline for his age, and at just 21, still has plenty of time to hone his craft.
Murphy is having a stellar 2016 campaign, slashing .322/.352/.648 with 17 home runs and 54 RBI in 71 contests. Nick Hundley and Tony Wolters have been adequate behind the plate at the big league level, but Murphy could get called up in September if the Rockies need an extra power bat.
An injury-riddled year ends on a disappointing note for Stephenson, one of Cincinnati's most valued prospects. In 39 games for Single-A Dayton, he hit .216 with three home runs and 16 RBI. Stephenson will likely ease back into baseball activities following the surgery, but should see a minor league starting role to begin the 2017 season.
As is typically the case whenever Jon Lester starts, David Ross will open the game behind the plate, and Contreras will come off the bench. Contreras is seeing more time off now than he was when he originally joined the Cubs in June, but he has remained effective with the bat, posting a .275/.351/.431 slash line this month.
Herrmann's rehab assignment was halted temporarily after he felt soreness in his hamstring, but it appears he is feeling good enough to get back on the field. It's not clear how many rehab games Herrmann will need, but his return to the Diamondbacks is not far off.
This should be considered regular rest for d' Arnaud, who sits more than the average catcher due to his mediocre play. He's been heating up a bit at the dish recently, collecting a hit in five of his last six games and batting .455/.520/.591 over that span.
Posey's day off was likely scheduled ahead of time, as Sunday day games generally result in a lot of regular days off for catchers. It came at a good time too, with Posey going 0-for-8 at the plate over the last couple days. Trevor Brown will replace him in the lineup Sunday, batting eighth, but Posey should return behind the dish Tuesday when the Giants open their next series in Los Angeles.