I liked the under myself when cappin this Men On Base for starting pitchers only 21.66. At 21 MOB I would look for a 8u20 or 7.5 total so the 9 seems a bit high.
But, then Sysat come in with his sytem plays and says he's got an over 9 on the game for 2 units so I'm going to look at that and consider the line went from 9u15 to 9u30 gotta think Joe Public is on the under here as well so by taking the over playing against the public.
Good luck to you either way.