They are the same. A screwball will break to the right from a right handed pitcher and to the left from left handed pitcher.
A left-handed pitcher is called a "southpaw".
It depends on if there right or left handed. if they are right handed than the right leg if they are left handed than the left leg
They don't only pitch to left-handed batters; they pitch to both right and left-handed batters, the same way a right-handed pitcher pitches to both.
if it's a right handed pitcher
As a general rule, in pressure situations managers seem to like having a left handed pitcher facing a left handed batter and a right handed pitcher facing a right handed batter. One explanation could be the angle the ball travels ... a curve ball from a left handed pitcher moves away from a left handed hitter while it moves towards a right handed hitter. Odds are a hitter is not going to hit a ball that is moving away as hard as is a hitter that has the ball moving in. Of course, if that curve ball moves to the center of the plate it is gonna get hammered regardless of whether a lefty or righty is batting.
A left handed pitcher can get a curve ball to break more than a right handed pitcher throwing a screw ball against a slap hitter hitting left handed.
A screwball in baseball is a pitch thrown in the opposite direction of a curveball or slider. A right-handed pitcher who throws a screwball breaks from left to right, vice versa for a left-handed pitcher.
The answer is because left handed batters hit worse off left handed pitchers. There are two reasons for this. The first reason is spin. A left handed pitcher will more easily be able to put spin on a ball that causes the pitch to move from the right side to the left side of the plate (from the catcher's view). This spin moves away from a left handed hitter and toward a right handed hitter. It is believed, with lots of data to support it, that a ball spinning away from a hitter is harder to hit than one spinning closer to the hitter. That's one reason a left handed batter is worse at hitting a left handed pitcher. The other reason is sight and release points. The same principle of spin applies that a pitch moving away from the batter is harder to hit than one moving closer to a batter. Because of the pitcher's release point, a left handed pitcher will release the ball somewhere to the right of the mound (from the catcher's view) when the ball is thrown. If we assume the ball has no spin and is pitched to the center of home plate, it will have moved from the right of the mound to the center of the plate. This movement from a left handed pitcher is going away from a left handed hitter and going closer to a right handed hitter. There is not much difference between how well right handed batters fare against right handed pitchers and left handed pitchers because right handed pitchers are so common that right handed batters don't have the same level of disadvantage as left handed batters do against left handed pitchers. But the reason why right handed batters are better than left handed batters against left handed pitchers is mostly explained with spin and release points.
Al Smith - left-handed pitcher - died in 1977.
Craig Anderson - left-handed pitcher - was born in 1980.