List #40 comes with 39 days left.
5. Nick Masset (3.6 WAR)
Nick Masset is the most recent Red of note to wear #40. Masset, of course, was acquired from the White Sox for Ken Griffey Jr., which is not something that every player can probably say. He pitched 3 really great seasons for the Reds, including setup duty on the 2010 division champion team. Unfortunately, he's been hit with the injury bug since the end of the 2011 season, spending the last two years rehabbing. He signed with the Rockies before ST this year, so hopefully he'll be able to bounce back.
4. Brett Tomko (4.5 WAR)
Tomko's Reds tenure is mostly known as a trade asset, but he was actually the Reds' 2nd round pick from 1995. He broke into the majors in '97 and pitched for the Reds until '99. He ended up starting 79 games for the Reds, total, with a 4.35 ERA. He got traded after that and went on to pitch many more years in the major leagues.
3. Tom Acker (4.7 WAR)
According to bWAR, Acker is the most valuable #40 to play for the Reds so far. He pitched for the Reds from 1956 to 1959, making 153 appearances, most of them in relief. He was from New Jersey, which I'm sure Todd Frazier would appreciate.
2. Jack Armstrong (0.5 WAR)
Armstrong had a few years which clouded his bWAR, but his 1990 season is good enough to get him on this list. He went 12-9 in 27 starts with a 3.42 ERA, by far his best. He made the All-Star team that year, and of course won a championship. He was traded after the '91 season. (Trivia: who for?)
1. Pat Zachry (3.2 WAR)
The 1976 Rookie of the Year was a tough choice, but is deserving of the honor. He made 28 starts in 1976, and went 14-7 with a 2.74 ERA to win the award. Of course, he got a WS ring too.
He was traded for the aforementioned Tom Seaver. He was a longtime Met, and played until 1985.
#39 will be later today!