Question: The Boys of Summer is a 1972 non-fiction baseball book, in it he tracks the lives of which American professional baseball player? 

Context articles: Charles Teague (baseball)
D'Vontrey Richardson
Wally Kopf
The Boys of Summer (book)
Pee Wee Reese
Babe Ruth
Larry Doby
Pat Friel
Tim Jorgensen
George Capron

Charles Clyde Teague (born 1924) was an American professional baseball player.
 A second baseman, he played in minor league baseball.
 As a college baseball player for Wake Forest University, he was named an All-American in three seasons.
 In 2010, he was inducted into the National College Baseball Hall of Fame.
D'Vontrey D'Wayne Richardson is an American professional baseball player playing for the Somerset Patriots in the Canadian-American Association of Professional Baseball league.
 Richardson spent the first five years of his professional baseball career in the Milwaukee Brewers minor league baseball system but was released by the team on April 2, 2015.
 He then signed with the Laredo Lemurs of the American Association of Independent Professional Baseball league on April 14, 2015.
 Richardson was acquired by New Jersey in August 2015.
Walter Henry "Wally" Kopf (July 10, 1899 – April 30, 1979) was a German American professional baseball player whose career spanned two seasons, which included one in Major League Baseball (MLB) with the New York Giants (1921).
 He played only two games, making his debut on October 1, 1921 and his final appearance the next day.
 In those games, he played third base, compiling one hit in three at bats.
 In 1922, he played in the minor leagues with the Oakland Oaks, Reading Aces, and the Newark Bears.
 Before pro-baseball, Kopf attended Dartmouth College (1919–21).
 He served in World War I.
 After his baseball career was over, he moved to Cincinnati where he worked as a building contractor.
 He was the younger brother of professional baseball player Larry Kopf.
The Boys of Summer is a 1972 non-fiction baseball book by Roger Kahn.
 After recounting his childhood in Brooklyn and his life as a young reporter on the "New York Herald Tribune", the author relates some history of the Brooklyn Dodgers up to their victory in the 1955 World Series.
 He then tracks the lives of the players (Clem Labine, George Shuba, Carl Erskine, Andy Pafko, Joe Black, Preacher Roe, Pee Wee Reese, Carl Furillo, Gil Hodges, Roy Campanella, Duke Snider, Jackie Robinson and Billy Cox) over the subsequent years as they aged.
 The title of the book is taken from a Dylan Thomas poem that describes "the boys of summer in their ruin".
Harold Peter Henry "Pee Wee" Reese (July 23, 1918 – August 14, 1999) was an American professional baseball player.
 He played in Major League Baseball as a shortstop for the Brooklyn and Los Angeles Dodgers from 1940 to 1958.
 A ten-time All Star, Reese contributed to seven National League championships for the Dodgers and was inducted into the Baseball Hall of Fame in 1984.
 Reese is also famous for his support of his teammate Jackie Robinson, the first modern African American player in the major leagues, especially in Robinson's difficult first years.
George Herman "Babe" Ruth Jr. (February 6, 1895 – August 16, 1948) was an American professional baseball player whose career in Major League Baseball (MLB) spanned 22 seasons, from 1914 through 1935.
 Nicknamed "The Bambino" and "The Sultan of Swat", he began his MLB career as a stellar left-handed pitcher for the Boston Red Sox, but achieved his greatest fame as a slugging outfielder for the New York Yankees.
 Ruth established many MLB batting (and some pitching) records, including career home runs (714), runs batted in (RBIs) (2,213), bases on balls (2,062), slugging percentage (.690), and on-base plus slugging (OPS) (1.164); the latter two still stand today.
 Ruth is regarded as one of the greatest sports heroes in American culture and is considered by many to be the greatest baseball player of all time.
 In 1936 , Ruth was elected into the Baseball Hall of Fame as one of its "first five" inaugural members.
Lawrence Eugene Doby (December 13, 1923 – June 18, 2003) was an American professional baseball player in the Negro leagues and Major League Baseball (MLB) who was the second black player to break baseball's color barrier.
 A native of Camden, South Carolina and three-sport all-state athlete while in high school in Paterson, New Jersey, Doby accepted a basketball scholarship from Long Island University.
 At 17 years of age, he began his professional baseball career with the Newark Eagles as the team's second baseman.
 Doby joined the United States Navy during World War II.
 His military service complete, Doby returned to baseball in 1946, and along with teammate Monte Irvin, helped the Eagles win the Negro League World Series.
Patrick Henry Friel (June 11, 1860 – January 15, 1924) was an American professional baseball player from the early 1880s to the mid-1890s.
 Friel was born in Lewisburg, West Virginia, and his brother Bill Friel was also a professional baseball player.
 He began his minor league baseball career in 1883, and continued through the end of the 1896 season.
 During that timespan, he played for the notable minor league team, London Tecumsehs and two Major League Baseball teams, the Syracuse Stars in 1890 , and the Philadelphia Athletics in 1891 .
 Friel died at the age of 63 in Providence, Rhode Island, and is interred at St. Francis Cemetery in Pawtucket, Rhode Island.
Timothy Scott Jorgensen (born November 30, 1972) is a former professional baseball player and high school baseball coach.
 As a college baseball player for the University of Wisconsin–Oshkosh, Jorgensen set Division III all-time records for most home runs in a single season and for most career home runs.
 He played professional baseball until 1999 and was later inducted into the National College Baseball Hall of Fame.
George H. Capron (July 27, 1886 – October 1972) was an American football and baseball player.
 Capron played football and baseball for the University of Minnesota from 1907 to 1908.
 In 1907, the Minnesota football team scored only 55 points, and "Capron accounted for 44 of them with dropkicked field goals at four points each."
 He was selected as a third-team All-American by Walter Camp at the end of the 1907 season.
 Late in his career at the University of Minnesota, Capron became involved in a controversy over his eligibility when reports surfaced that he had played professional baseball under a false name.
 Capron later admitted that he played baseball under the name Robb at Meridian, Mississippi in 1908 and at Mattoon, Illinois in 1907.
 From 1909 to 1910, Capron played two years of professional baseball in the Northwestern League.
 In 1909, he played 155 games as the left fielder for the Seattle Turks, compiling 164 hits, 27 doubles, 8 triples, 15 home runs, and a .275 batting average.
 In 1910, he played 35 games for the Vancouver Beavers though his batting average dropped to .207.
 He also played professional football in the early days of the professional game in the 1910s.
 He resided in Fresno, California in his later years.