This week I caught two High-A games between the Bowling Green Hot Rods and the Wilmington Blue Rocks. Below are my scouting notes from those games.Theo Gillen was the Tampa Bay Rays’ 2024 first-round pick, back when he was a high school infielder who couldn’t throw well while recovering from shoulder surgery. He’s now an outfielder who landed at No. 27 on my most recent top prospects ranking. As of Friday, he was hitting .327/.432/.582 in High A while riding a nine-game hitting streak.In the two games I saw, Gillen, 20, showing outstanding plate discipline and ability to foul off pitches when behind in the count. In Friday’s game, he saw 30 pitches in five plate appearances, including the last one, when he lined a first-pitch 94 mph fastball to center for a single.His approach is really advanced, and he made visible adjustments to different pitches. He even collected a pair of hits off a lefty in the first game, which has been his big weakness this season. The swing hits that sweet spot between being short enough to get him on time to the ball and long enough to let him build up some momentum (and bat speed) before he makes contact.Gillen played left field in one game and center field in the other, playing better than average at both spots. I didn’t get a great read on his running speed out of the box, but watching him on the bases, he’s at least a 60 (on the 20-80 scouting scale). He looks like a future All-Star, especially given how much smarter a hitter he is than any other A-ball hitter I’ve seen this season.Sime makes his High-A debut with plenty to work onWashington Nationals right-handed pitching prospect Miguel Sime Jr. earned some press in March when he struck out J.J. Wetherholt on a 100.8 mph fastball in the Cardinals-Nationals Spring Breakout game. He made his High-A debut for Wilmington on Friday night and continued to show that arm strength, hitting 101 once and 100 twice in three-plus innings. The rest of the package is a long way off, however.Miguel Sime Jr. has a power arsenal but needs to learn to harness his stuff and throw more strikes. (Jared Blais / MLB Photos via Getty Images)Sime, 19, started the year in Low A, where almost two-thirds of the batters he faced either walked (21 percent) or struck out (45.4 percent), so the Nationals promoted him presumably so he’d be more challenged by better hitters. Bowling Green’s lineup is loaded and did test him, as Sime allowed five hits, matching his season high, and walked two in 3 2/3 innings.His four-seamer ranged from 95 to 101, mostly sitting 96 to 98. He showed three off-speed pitches, with none of them better than average. Sime has a changeup that he throws hard, so the arm speed is good, although its movement is just fair. His vaunted slider was below average, and he had no feel for it, faring better with his low-80s curveball, which has the power of a slider or slurve but curveball shape and appears to break downward very late.Overall, however, his biggest issue is throwing strikes, and I think a lot of that is the delivery and the whole style of pitching. This is all power, all the time, like you typically see in a reliever. He comes from a high three-quarters slot, and his arm is always fighting to catch up to his front side, with his front shoulder still tilted skyward when his front foot is planted, so he’s coming back uphill and then trying to get the ball back down into the zone.