A quarter is another way of saying one fourth, in this setting, one fourth of a year = three months. Quarterly means something that happens every 3 months. Edit
Outfielder Ty Cobb, whose career ended in 1928, has the highest batting average in Major League Baseball (MLB) history. He batted .366 over 24 seasons, mostly with the Detroit Tigers. In addition, he won a record 11 batting titles for leading the American League in BA over the course of an entire season.
CC Sabathia. Carsten Charles CC Sabathia, Jr. (born July 21, 1980) is an American professional baseball pitcher for the New York Yankees. Upon signing with the Yankees prior to the 2009 season, Sabathia became the highest-paid pitcher in MLB history.