Rays C Justin O'Conner, Double-A Montgomery: 2-for-4, HR, 2B, 2 R, RBI, K -- The 23-year-old has had a tough time adjusting to the Southern League this year but has recently busted out of a season-long slump. In 10 July games, O'Conner has a .351/.400/.676 line, slugging a pair of home runs and drastically cutting back on his strikeouts. A 10-game sample doesn't mean O'Conner's found the potion to cure his Double-A ails, but it is a positive sign. The 2010 first-rounder (31st overall) emerged as a top prospect last year largely based on his defense, so he won't have to contribute much at the plate to become a Major Leaguer. If he can channel his well above-average power and contribute 15-plus homers per year, he could be an All-Star player.

Rays 1B Jake Bauers, Double-A Montgomery: 4-for-4, RBI -- We'll stick with the Biscuits for one more. Bauers was a breakout performer in 2014 with Class A Fort Wayne in the Padres' system, showing a promising hit tool and above-average defense at first base. The only question for the 2013 seventh-rounder was power -- he hit just eight homers in the Midwest League. After being traded to the Rays in the Wil Myers deal, the 19-year-old has discovered some more pop, slugging seven homers in the pitcher-friendly Florida State League before earning a promotion to Double-A last month. He's been even better since, posting a .333/.385/.465 line. The comp du jour for Bauers last year was Daric Barton, in part because they both attended the same California high school and also because they get on base and play solid defense without much power. Bauers is pushing up his own ceiling with his power this year and has a shot to out-produce Barton's 7.7 career Wins Above Replacement (per Fangraphs).

Mets RHP Gabriel Ynoa, Double-A Binghamton: 7 IP, 4 H, R, ER, 5 K -- Ynoa retired 17 straight Portland hitters at one point, recovering from a rocky first inning to go at least 6 2/3 innings for the sixth consecutive outing. Ynoa's game is built around pitching to soft contact, something he's done remarkably well this season. He's striking out less than a batter every two innings, which isn't the kind of rate you expect from an emerging prospect. Ynoa has shown big league stuff in the past, though, and should be able to miss more bats than that moving forward. It's likely the low whiff rate is a result of Ynoa's aggression in the strike zone, a game plan that should be tweaked as the right-hander continues to climb the Minor League ladder.

Nationals RHP Austin Voth, Double-A Harrisburg: 7 IP, 4 H, R, ER, BB, 8 K -- Voth has a sturdy 6-foot-1 frame and looks like he could chew up some valuable innings in a big league rotation. The 2013 fifth-rounder was utterly dominant at the lower levels of the Minors and has continued to produce above-average results in the Eastern League. He's striking out nearly a batter per inning while keeping the ball in the strike zone and in the park, all of which are positive indicators. Overall, Voth is 4-5 with a 3.08 ERA in 18 appearances (17 starts) with the Senators this season.

Cardinals LHP Corey Littrell, Class A Advanced Palm Beach: 6 1/3 IP, 4 H, 7 K -- Litrell hasn't allowed an earned run over his past 24 innings and hasn't walked a batter since May 17, a stretch of 43 1/3 innings over 12 outings. As you might guess from the latter, command is Littrell's best asset. The University of Kentucky product is very advanced with his fastball control,and also features a curveball and a changeup, with the former earning above-average grades. There isn't much of a ceiling for Littrell, but he might be the most advanced pitcher in the Florida State League right now and is a relatively good bet to become a back-end starter.

A's SS Franklin Barreto, Class A Advanced Stockton: 4-for-5, HR, 2B, 3 RBI, 2 R -- Barreto arrived out of shape for his first Spring Training with Oakland and then spent the first month of the season playing catch up. After using March to condition himself and April to get his timing back, Barreto has emerged as the budding offensive force the A's thought they were acquiring when they got him from Toronto in the Josh Donaldson deal. Barreto has hit safely in 11 straight games and boasts a .442/.463/.750 slash line in July. Just 19, Barreto could find himself in Double-A by the end of the season.