From the Tuesday Prospect notebook (BA) http://www.baseballamerica.com/minors/tuesday-prospect-notebook-billy-hamilton-takes-off/ Dillon Maples, rhp, Cubs: The Cubs spent $2.5 million to sign Maples out of the 14th round of the 2011 draft, his power fastball and curveball outweighing concerns about his delivery. They haven’t seen much of him yet, as a tweaked elbow limited him to just 10 innings last year and he didn’t join low Class A Kane County this season until mid-May. The 21-year-old got hit hard in his fourth start on May 28, allowing seven earned runs in three innings, but he bounced back with his best outing on Monday. The righthander struck out seven over five shutout innings against Cedar Rapids. Granted, Cedar Rapids’ lineup was without Byron Buxton, still held out with a sore thumb, but Maples did limit them to two hits and three walks. Two rough outings have his ERA still at a lofty 7.06, but the good news is he’s struck out 23 in 21 2/3 innings with a 2.07 ground out-to-air out ratio. Christian Villanueva, 3b, Cubs: Continuing with the Cubs theme, Villanueva’s prospects for career advancement improved greatly when he got out from behind Adrian Beltre and Mike Olt once the Rangers dealt him to the Cubs in last year’s Ryan Dempster trade. Opening his first full year in his new organization, Villanueva had a quiet April for Double-A Tennessee, batting .205, but he turned around to hit .304 in May and went 3-for-7 in yesterday’s doubleheader against Jacksonville. The 21-year-old’s offensive game is more geared toward line drives than homers (he leads the Southern League with 18 doubles), but he’s gone deep in two of his last three games, including one in the second game yesterday, to bring his season’s total to five.