Type 1 diabetes affects primarily young children. But that is not the case for people with Type 1 diabetes participating in competitive sports. All of them are diagnosed in adulthood or adolescence with type 1 diabetes.
Type 1 diabetes is prevalent among the sportiest participating in certain sports activities like driving bicycles, triathlon, etc. ... The difference in incidence and prevalence of type 1 diabetes between certain sports activities is manifold.
In contrast, Type 1 diabetes among competitive sportiest in certain sports (competitive tennis players, etc.) is unheard of or almost non-existent.
Type 1 Diabetes among Professional Cyclists
The Team Novo Nordisk professional cycling team is made up entirely of riders living with type 1 diabetes.
Type 1 Diabetes among Professional Baseball Players
Interesting fact: Of 10 professional baseball players diagnosed with T1DM, 6 of them are Pitchers
Samuel Babson "Sam" Fuld (born November 20, 1981) is an American professional baseball outfielder- diagnosed with diabetes at the age of 10
David Michael Hollins (born May 25, 1966 in Buffalo, New York) is a former third baseman in Major League Baseball. - During the 1994 season Hollins was diagnosed with diabetes
James Augustus "Catfish" Hunter (April 8, 1946 – September 9, 1999) was a professional baseball pitcher player in Major League Baseball - In spring training (1978), he was diagnosed with diabetes
Jason Michael Johnson (born October 27, 1973, in Santa Barbara, California) is a starting pitcher for the Amarillo Sox in the American Association of Independent Professional Baseball - diagnosed with diabetes at the age of 11
Mark Christopher Lowe (born June 7, 1983) is a professional baseball relief pitcher - diagnosed with diabetes in 2008
Dustin Michael McGowan (born March 24, 1982) is an American professional baseball pitcher - diagnosed with diabetes in 2004
Brandon John Morrow (born July 26, 1984) is an American professional baseball pitcher - Morrow is a Type 1 diabetic who was diagnosed as a senior in high school.
Dave Pember (born May 24, 1978) is a former Major League Baseball pitcher - had type 1 diabetes since youth.
Jack Roosevelt "Jackie" Robinson (January 31, 1919 – October 24, 1972) was an American baseball - Near the time of his retirement, Robinson was diagnosed with diabetes, Robinson started out as first baseman; later he moved to second base (second baseman), a position he held for the rest of his career – (Diabetes Type: unknown)
Ronald Edward Santo (February 25, 1940 – December 3, 2010)  was an American third baseman in Major League Baseball - He was diagnosed with Type 1 diabetes at the age of 18.
Note! There are 9 fielding positions in baseball. Each position conventionally has an associated number, which is used to score putouts: 1 (pitcher), 2 (catcher), 3 (first baseman), 4 (second baseman), 5 (third baseman), 6 (shortstop), 7 (left fielder), 8 (center fielder), and 9 (right fielder).