On-base percentage, or OBP, measures the frequency with which a batter reaches base. OBP is expressed as a decimal rounded to three places, as in .300. Thus, OBP looks like batting average. However, instead of expressing the number of hits per at-bat, OBP represents the number of times on base per opportunity. The formula is simple, and one needs just five basic counting statistics to calculate OBP. These five stats are hits, walks, hit-by-pitch, at-bats, and sacrifice flies. The formula is:
GB% – This stands for ground ball percentage, which is the percentage of balls a player hits that end up as ground balls. The league average on grounders last year was just .239, which means that only about 24% of ground balls end up as hits. So, because of that, you would expect players who hit a lot of grounders to have a lower BABIP, right? This is not necessarily true, however, because most ground ball hitters end up being the speedsters that are more likely to beat out grounders than your average player. In general, you can expect players with a high GB% to have a slightly higher BABIP, but you definitely want to take a look at their speed before making that assumption.
Adjusted ERA+ Base runs Batting average on balls in play Batting park factor Catcher's ERA Defensive Runs Saved Extrapolated Runs Game score Isolated Power Range factor Runs created Runs produced Secondary average Speed Score NERD Out of zone plays made Ultimate zone rating Value over replacement player Weighted on-base average Wins Above Replacement Win probability added Win Shares

Prior to 2010 we only listed the top 100 and monitored those who made and slipped off the list. Here is that original fast fact preserved and now useless due to the list including 1000 names: Modern superstars are making the list as they meet the one-thousand minimum games played threshold: In 2001 Jeff Cirillo & Manny Ramirez met the requirements and joined the top one-hundred. In 2002 Cirillo slipped off the chart and Jason Giambi made it while Chipper Jones & Alex Rodriguez missed the cutoff by less than 2/1000 of a point. In 2003 Jason Giambi slipped off the chart, Chipper Jones just missed it once again (his career average is .30870), and Vladimir Guerrero vaulted onto the list at forty-first — higher than any other active player, that is until 2004 when Todd Helton launched into the top 20 all-time.
OPS stands for on base plus slugging and is exactly what it sounds like. You take a player’s OBP and add it to their SLG to get OPS. This stat is often used to measure a player’s overall ability as a hitter, combining their skill at getting on base (OBP) with their aptitude to hit for power (SLG). Sometimes it will be included at the end of a typical slash line, so if you see a slash with four different numbers in it, then OPS is what the fourth one represents.

You just need to look at some of the players hitting between .280 and .285 to see the validity in Correa's point: Boston Red Sox second baseman Dustin Pedroia, Cardinals third baseman Matt Carpenter, Cincinnati Reds third baseman Todd Frazier, San Francisco Giants right fielder Hunter Pence, Milwaukee Brewers center fielder Carlos Gomez and Baltimore Orioles center fielder Adam Jones qualify for the new .300. Every one of them was an All-Star this year.
Hitting a baseball is one of the toughest skills in all of sport. The entire sequence, from the pitcher's release of the ball to the contact with the bat, happens in the blink of an eye. This quick series of events combines two of the most important skills for a baseball player: hand-eye coordination and power development. Hand-eye coordination helps the batter locate the ball during its flight and appropriately maneuver the bat. The power element is crucial for adding distance to hits and building a well-rounded batter.
Every hitter is entitled to their own style or preference when it comes to stance, set-up, and load. However, when the stride foots lands, all hitters are very much alike in their movements to and through contact. My emphasis will focus on the “non-negotiable” of consistent, hard contact—bat path. Learning to control the bat barrel is an enormous step forward in becoming the best hitter they can be.  
I do not consider loading the body to be a part of the actual swing, because it isn’t. However, there CAN NOT be an efficiently powerful swing without a proper loading sequence. The loading sequence for a any hitter is fundamentally the same but it may change due to the size, strength, and talent level of the individual. Players who are limited in size need to think about a more obvious momentum builder move like Jose Bautista shown below.

OBP refers to how frequently a batter reaches base per plate appearance. Times on base include hits, walks and hit-by-pitches, but do not include errors, times reached on a fielder's choice or a dropped third strike. (Separately, sacrifice bunts are removed from the equation entirely, because it is rarely a hitter's decision to sacrifice himself, but rather a manager's choice as part of an in-game strategy.)

The Power Drive Performance Sled trains Baseball players to initiate their power from the ground up for Pitching, Hitting, Position Throwing and Fielding. It is a baseball and softball training aid for developing skills and also is a conditioning aid for adding functional strength. The PPD Sled can be used while performing baseball and softball skill movements while practicing pitching, hitting, position throwing and fielding making player more athletic. It is ergonomically designed for baseball and softball training. Sled training package includes 3 separate products, a Power Sled, TurfCordz Waist Belt and Turfcordz 10′ Tether Pull Strap with 2 Caribinas. All three products in sled training package are made 100% in the USA. Owners have access to web based training site with workout drills for pitching, hitting and fielding.
On-base percentage (OBP): Unlike batting average, on-base percentage doesn't ignore working the count to earn a walk, stepping into an inside pitch or being such a terrifying hitter that one gets pitched around and/or intentionally walked often. There are four players with more than 2,000 career walks: Barry Bonds, Rickey Henderson, Babe Ruth and Ted Williams. And we're supposed to ignore that and concentrate on batting average? In its purest form, OBP is basically measuring the amount of times a hitter does not make an out. With only 27 precious outs in a regulation game, this stat is paramount. That this isn't mainstreamed as more important than batting average makes very little sense to me. [For more on AVG vs. OBP, click here. I wrote a lot more about it] -- Snyder

Watching a player in batting practice will tell you whether or not he can square up a baseball. If he is hitting one-hoppers through the infield that land in the dirt to line drives that are short-hopping the wall, he is squaring up the baseball. If he is consistently hitting balls that land within 45 feet of the plate or are high pop flies, his swing plane is not right and he will not be able to hit at a high level.