Notes from high-A and low-A spring training games between the Rangers and the White Sox:• Texas right-hander Wilfredo Boscan pitched in the short-season Northwest League last year at age 18 and was dominant, fanning 70 and walking 11 in 69 1/3 innings while allowing just four home runs. Boscan doesn't do it with power but with good feel and a plus changeup. His fastball is average at 88-92 mph; he's young enough for that to improve but doesn't have huge physical projection. His curve is inconsistent and slow with a big early break, and he may be a candidate for a slider unless he can show better arm speed on the curve. The changeup is his real weapon, 80-81 mph with very good fade and tumble, and he maintains his arm speed extremely well on it. You can see why he missed so many bats in the Northwest League last year -- minor league hitters are just not going to pick up on a pitch like that -- but he needs a better breaking ball to become an elite starter prospect.• Texas signed 16-year-old Richard Alvarez out of Venezuela in the fall, so he'll make his pro debut at some point this summer in some form of rookie or complex ball. Right now, his fastball is just 85-86 mph, but it's very easy, and he showed -- of course -- a good changeup. His delivery is fluid and easy and he repeats it well.• Wilmer Font threw an inning for the Rangers' low-A team as well, touching 98 mph as usual with a good changeup. He's healthy again after missing last year with shoulder and knee injuries, and is also in better overall shape, with less excess baggage around his midsection. He's 19 with absurd arm strength and at least one decent secondary pitch. You don't need me to tell you this is a good thing.• Right-hander Nate Jones was the White Sox's fifth-round pick in 2007 out of Northern Kentucky University, a Division II school that has produced only two big leaguers, relievers Chris Hook (65 innings in the majors) and Scott Wiggins (2 2/3 innings). I wouldn't say Jones is likely to join that list just yet, but he has serious big-league stuff, going 92-98 mph on Thursday and throwing a couple of nasty sliders with good tilt and short but hard breaks. He's a pie-thrower who's going to have trouble repeating his delivery; his command wasn't great on Thursday and his pro performance to date has been, to be kind, lousy, although much of his bad work came as a starter. In relief last year, he threw 22 2/3 innings, walked 10, and struck out 33, allowing 16 hits. He's interesting, and big-league relievers often seem to come out of nowhere.I'll have a few more notes on these two teams this weekend.