Presented here are the top 10 runs created tallies for position-player prospects from weekend series.

• Brian Goodwin isn't the only Nationals center-field prospect making noise in the second half. High Class A Potomac's Michael Taylor, a prep shortstop who moved to the outfield last season, clubbed two of his three homers over the weekend, and he's now batting .296/.359/.521 with 10 extra-base hits in 20 games this month.

• Pop-up prospect Gregory Polanco has batted .412/.470/.637 with 17 extra-base hits and just 10 strikeouts in 29 games since the South Atlantic League all-star break. Going a bit further back, just two SAL batters have a higher OPS than Polanco's .999 since June 1. Look for much more on the Pirates' center field prospect this week in a feature by J.J. Cooper.

• Credit Braves first baseman Joey Terdoslavich with getting back on track with Double-A Mississippi after a positively brutal two-month overture in Triple-A this season, during which he put up a .515 OPS in 53 games. Since joining the Southern League, he's batted .304/.348/.466 with 14 doubles in 148 at-bats.

Top Performance By A Prospect-Eligible Player Outside His Team's Top 30

Phillies 2011 fourth-rounder Cody Asche reached Double-A in late June and he's recently found his footing with Reading. The 22-year-old third-baseman tallied 5.1 runs created over the weekend by batting 6-for-14 (.429) with a pair of home runs and three walks. 

Noteworthy Performance In Short-Season League Play

Astros $2.6-million man Ariel Ovando has enjoyed a fine campaign in the Rookie-level Appalachian League, batting .330/.372/.482 in 112 at-bats for Greeneville. The 18-year-old Dominican right fielder smashed his first two home runs of the season over the weekend and went 5-for-10 at the plate while mixing in a pair of walks and a double.

Rough Stretch

Perhaps no prospect has more raw power than Twins third baseman Miguel Sano, a 19-year-old who leads the Midwest League with 20 homers. He failed to add to that total this weekend, going 0-for-13 with six strikeouts for low Class A Beloit. Sano has batted .259/.392/.519 with five homers in 25 games during the second half, his average suppressed by an average of one strikeout per game.

The Bill James-devised runs created metric (Wikipedia entry explains ’02 version) rewards batters for avoiding outs and reaching base safely (on-base percentage) and for accumulating total bases (slugging percentage), two factors that correlate strongly with run scoring, and for obvious reasons.