Question: What 1 and 1/2 mile race, also known as "test of the champion," did jockey Irad Ortiz JR win his first American Classic?

Context articles: 2014 Bojangles' Southern 500
Irad Ortiz Jr.
Jeff Evanshine
Eddie Arcaro
Andres Ortiz
Al Unser
2016 Belmont Stakes
Marcus Hurley
Orange County Speedway
Burton Downing

The 2014 Bojangles' Southern 500, the 58th running of the event that traces its lineage to the 1957 Rebel 300, was a NASCAR Sprint Cup Series stock car race held on April 12, 2014, at Darlington Raceway in Darlington, South Carolina.
 The race was contested over 374 laps – extended from 367 laps due to two attempts at a green–white–checker finish – on the 1.366 mi oval, it was the eighth race of the 2014 NASCAR Sprint Cup Series.
 Kevin Harvick of Stewart-Haas Racing won the race, his second win of the season and first at Darlington, while Dale Earnhardt, Jr. finished second.
 Jimmie Johnson, Matt Kenseth, and Greg Biffle rounded out the top five.
 The race was also the first Darlington race won by a polesitter since Dale Jarrett, in the 1997 Rebel (then a 400-mile race).
 The top rookies of the race were Kyle Larson (8th), Austin Dillon (11th), and Justin Allgaier (23rd).
 It was the longest race in Darlington Raceway history.
Irad Ortiz Jr. (born in August 11, 1992) is a jockey in American Thoroughbred horse racing who has been a leading rider in New York since 2012.
 He won his first Breeders' Cup race on Lady Eli in 2014, and his first American Classic on Creator in the 2016 Belmont Stakes.
Jeff Evanshine (born October 2, 1973 in Placentia, CA) is a former professional road bicycle racer from the United States.
 He was the 1991 UCI Junior Road World Champion.
 On July 14, 1991, Evanshine attacked out of the shattered field on Colorado Springs' Garden of the Gods circuit, caught the Belorussian Alexandre Kozlov on the final lap of the race, and won solo, in dramatic fashion with a lead of nearly one minute, posting a final time of 3 hours, 3 minutes, 33 seconds for the 77-mile race.
 With his victory, Evanshine became the first American since Greg LeMond in 1979 to win a Junior Road World Championship.
George Edward Arcaro (February 19, 1916 – November 14, 1997), known professionally as Eddie Arcaro, was an American Thoroughbred horse racing Hall of Fame jockey who won more American classic races than any other jockey in history and is the only rider to have won the U.S. Triple Crown twice.
 He is widely regarded as the greatest jockey in the history of American Thoroughbred horse racing.
 Arcaro was born in Cincinnati, Ohio, the son of an impoverished taxi driver.
 His parents, Pasquale and Josephine, were Italian immigrants and his father held a number of jobs, including taxi driver and operator of an illegal liquor enterprise during Prohibition.
 Arcaro was born prematurely, and weighed just three pounds at birth; because of this, he was smaller than his classmates and was rejected when he tried out for a spot on a baseball team.
 His full height would reach just five-foot, two inches.
 Eventually nicknamed "Banana Nose" by his confreres, Arcaro won his first race in 1932 at the Agua Caliente racetrack in Tijuana, Mexico; he was 16 years old.
 In 1934, the inaugural year of Narragansett Park, Arcaro was a comparative unknown who rode many of his early career races at 'Gansett.
Andrés Ortiz (born in Fajardo, Puerto Rico, c. 1987 - died 23 May 2015) was a Puerto Rican basketball player who played for the Indios de Mayagüez of the Baloncesto Superior Nacional the professional men's basketball league in Puerto Rico.
 Popularly known as Andy Ortiz Jr he was also nicknamed "Corky" after his father, a streetball star in his own right.
 He died at age 28 following a car accident.
 As part of Team San Juan, alongside his teammates Jonathan García, José López and William Orozco, he won the first world title in the inaugural season of FIBA 3x3 World Tour held in Miami, Florida on September 2012.
Alfred "Al" Unser (born May 29, 1939) is an American automobile racing driver, the younger brother of fellow racing drivers Jerry and Bobby Unser, and father of Al Unser Jr..
 Now retired, he is the second of three men to have won the Indianapolis 500-Mile Race four times, the fourth of five to have won the race in consecutive years, and won the National Championship in 1970, 1983, and 1985.
 He is the only person to have both a sibling (Bobby) and child (Al Jr.) as fellow Indy 500 winners.
 Al's nephews Johnny and Robby Unser have also competed in that race.
The 2016 Belmont Stakes was the 148th running of the Belmont Stakes.
 The 1+1/2 mi race, known as the "test of the champion", is the final jewel in Thoroughbred horse racing's American Triple Crown series, and was held on June 11, 2016, three weeks after the Preakness Stakes and five weeks after the Kentucky Derby.
 The race, which had no Triple Crown at stake (as Derby winner Nyquist lost in the Preakness), was broadcast by NBC beginning at 5:00 p.m. EDT, with pre-race coverage on NBCSN starting at 3:00 p.m.
 The race was won by Creator by a nose over Destin.
 2016 Preakness Stakes winner Exaggerator finished eleventh.
Marcus Latimer Hurley (December 22, 1883 – March 28, 1941) was an American cyclist who competed in the early twentieth century.
 He specialized in sprint cycling and won 4 gold medals in Cycling at the 1904 Summer Olympics and a bronze medal in the 2 mile race.
Orange County Speedway is a 3/8 mile (0.6 km) asphalt oval in Orange County, North Carolina, near Rougemont.
 It first opened in 1966 as 1/4 mile (0.4 km) and 5/8 mile (1.6 km) dirt oval (Trico Speedway), which operated until 1967 and 1973, respectively.
 The facility was reopened and paved in 1983.
 With a slogan of "the fastest 3/8-mile race track in America," the oval features 19 degree banking through the turns and 16 degrees on the straightaways creating three distinct grooves making for very fast turns.
 The aluminum grandstands stretch from Turn 4 all the way down the front straightaway to Turn 1.
 The speedway closed in 2003, but reopened on March 11, 2006 as an American Speed Association member track.
Burton Cecil Downing (February 5, 1885 – January 1, 1929) was an American racing cyclist who competed in the early twentieth century.
 An all round cycling talent, he competed in Cycling at the 1904 Summer Olympics and won two gold medals in the 25 mile and the 2 mile, three silver medals in the ¼ mile, ⅓ mile and mile and a bronze medal in the ½ mile race.