Having played baseball throughout his youth, Spalding first played competitively with the Rockford Pioneers, a youth team, which he joined in 1865. After pitching his team to a 26-2 victory over a local men's amateur team (the Mercantiles), he was approached at the age of 15 by another squad, the Forest Citys, for whom he played for two years. In the autumn of 1867 he accepted a $40 per week contract ($700 in today's dollars), nominally as a clerk, but really to play professionally for the Chicago Excelsiors, not an uncommon arrangement used to circumvent the rules of the time, which forbade the hiring of professional players. Following the formation of baseball's first professional organization, the National Association of Professional Base Ball Players (which became known as the National Association, the Association, or NA) in 1871, Spalding joined the Boston Red Stockings (precursor club to the modern Atlanta Braves) and was highly successful; winning 206 games (and losing only 53) as a pitcher and batting .323 as a hitter. William Hulbert, principal owner of the Chicago White Stockings, did not like the loose organization of the National Association and the gambling element that influenced it, so he decided to create a new organization, which he dubbed the National League of Baseball Clubs. To aid him in this venture, Hulbert enlisted the help of Spalding. Playing to the pitcher's desire to return to his Midwestern roots and challenging Spalding's integrity, Hulbert convinced Spalding to sign a contract to play for the White Stockings (now known as the Chicago Cubs) in 1876. Spalding then coaxed teammates Deacon White, Ross Barnes and Cal McVey, as well as Philadelphia Athletics players Cap Anson and Bob Addy, to sign with Chicago. This was all done under complete secrecy during the playing season because players were all free agents in those days and they did not want their current club and especially the fans to know they were leaving to play elsewhere the next year. News of the signings by the Boston and Philadelphia players leaked to the press before the season ended and all of them faced verbal abuse and physical threats from the fans of those cities. He was "the premier pitcher of the 1870s", leading the league in victories for each of his six full seasons as a professional. During each of those years he was his team's only pitcher. In 1876, Spalding won 47 games as the prime pitcher for the White Stockings and led them to win the first-ever National League pennant by a wide margin. In 1877, Spalding began to use a glove to protect his catching hand. People had used gloves previously, but they were not popular, and Spalding himself was skeptical of wearing one at first. However, once he began donning gloves, he influenced other players to do so. Spalding retired from playing baseball in 1878 at the age of 27, although he continued as president and part owner of the White Stockings and a major influence on the National League. Spalding's .796 career winning percentage (from an era when teams played about once or twice a week) is the highest ever by a baseball pitcher, far exceeding the second-best .690.

Answer this question "What type of pitching style did he have?" by extracting the answer from the text above.
premier pitcher