Diamond no Ace, Baby Steps Recommendations
Baby Steps features a main character similar to Eijun Sawamura (from Diamond no Ace) by the name of Maruo Eiichiro. They are similar in that they are both diamonds in the rough in their respected sports but with hard work and dedication, they begin to make names for themselves.
Note: Although Baby Steps has recently started (first episode came out on April 6, 2014), I have read most of the manga so that is how I am able to make this recommendation. I'll edit this as more episodes come out.
Sports genre & character development (skills progress)
Both are sports anime starting with characters who are either new or lackng at the sport. Both series show hard work and determnation with a bit of comedy to lighten the mood.