Diaz is one of eight players to make their big-league debuts for the Reds this season, along with starting pitchers Hunter Greene, Nick Lodolo and Graham Ashcraft, relievers Daniel Duarte and Jared Solomon and catchers Mark Kolozsvary and Chris Okey.
Best starting pitcher: Castillo made the All-Star team for the first time since 2019. He’s 3-4 with a 2.77 ERA in 13 starts and allowed three earned runs in 27 innings in his last four starts before the All-Star break.
Castillo began the season on the injured list and didn’t pitch until May 9. The team was 5-23 without him.
Best sophomore performance: In his second season, catcher Tyler Stephenson is hitting .319 with six home runs and 35 RBIs in 49 games. The team was 1-9 when he was sidelined by a concussion in April and 10-17 when he was sidelined by a broken thumb in June and early July.
Biggest disappointment (position players): Second baseman Mike Moustakas, a career .248 hitter, is hitting .210 in 63 games. He hit .208 last season in 62 games last season, and he’s hitting .214 in three seasons with the Reds.
Biggest disappointment (pitchers): Mike Minor, who the Reds acquired from the Kansas City Royals in March for reliever Amir Garrett, is 1-6 with a 6.21 ERA in eight starts. He did not make his season debut until June 3 because of a shoulder injury.
Best stat: Greene threw 39 pitches clocked at 100 miles per hour or more in a start April 16 and threw 38 in a game July 9. Those are the two highest totals in the pitch-tracking era (since 2008).
Greene has shown flashes of brilliance in his rookie season but is 3-11 with a 5.78 ERA in 18 starts. He leads baseball in home runs allowed (23).
Worst stat: The Reds rank last in baseball in team ERA (5.30). The relievers have a 5.42 ERA, which ranks last in baseball. The starters rank second to last with a 5.23 ERA.