He began working with Arizona State's throws coach David Dumble, who was heading a highly successful college throws group.[4] In his first year of collegiate competition, Clarke placed fourth in the shot put at the 2010 Mountain Pacific Sports Federation (MPSF) indoor meet. Outdoors, he was runner-up at the Pacific-10 Conference championships behind fellow Arizona State athlete Ryan Whiting and was part of a school sweep with his fellow alumnus Jason Lewis in third. Clarke was fifth at the NCAA Men's Division I Outdoor Track and Field Championships – a contest won by Whiting. The following year Clarke was second at the MPSF indoor meet and came ninth at the NCAA Men's Indoor Track and Field Championships. With Whiting having graduated, Clarke became the Sun Devils' leading thrower and he continued the team's success at the 2011 Pac-10 Outdoor Championships by winning the shot put, placing runner-up in the discus and coming seventh in the hammer throw.[1] He succeeded Whiting as the NCAA champion that year with a personal record throw of 19.75 m (64 ft 9+1⁄2 in) in the final.[5] At the end of the year he competed at the national level for a second time, placing 16th overall at the 2011 USA Outdoor Track and Field Championships.[6]
Clarke established himself as America's top collegiate thrower in the 2012 season by winning both the NCAA Indoor Championships and the NCAA Outdoor Championships.[7] He peaked for each final, with a personal best of 20.86 m (68 ft 5+1⁄4 in) indoors then an outdoor best of 20.40 m (66 ft 11 in). Regionally, he was the MPSF indoor champion and the Pac-12 outdoor champion. He again competed in the discus and hammer at the Pac-12 meet, ranking third and second respectively. He had a new best of 65.39 m (214 ft 6+1⁄4 in) in the hammer and ultimately finished tenth in that discipline at the NCAA Outdoor Championships.[1] He entered the 2012 United States Olympic Trials and made the final, coming eighth overall.[6] On distance he ranked in the American top ten for the shot put that season and within the top twenty athletes globally.[8]
Clarke began the 2013 indoor season with a series of throws beyond twenty meters, taking in victories at the MPSF meet and a fourth straight shot put title at NCAA level at the NCAA Indoor Track and Field Championships.[9][10] He also won the weight throw at the MSPF indoor championships. He set a hammer throw best of 66.18 m (217 ft 1+1⁄2 in) in April before going to the Pac-12 Conference Outdoor Championships to place fifth in that event and take a third straight shot put title[6] At the 2013 NCAA Division I Outdoor Track and Field Championships, he aimed to close his collegiate career with a fifth straight NCAA win, but was denied by a margin of three centimeters by Ryan Crouser of the Texas Longhorns.[11]
Clarke finished at Arizona State having won two NCAA Outdoor titles, two NCAA Indoor titles, and three consecutive titles at the MPSF Conference indoors and the Pac-12 Conference outdoors. His personal bests during his time there ranked him in the top ten of four different throws events. His tally of 24 points across the discus, shot put and hammer at the 2012 Pac-12 Championships made him second to only Dwight Phillips among highest scorers for Arizona State.[1]
Professional
After graduation from Arizona State, he continued to work with coach David Dumble, fitting in time between his mentor's college duties.[12] The 2014 USA Indoor Track and Field Championships saw him attain his highest national placing yet, taking fourth with a throw of 20.78 m (68 ft 2 in). His international professional debut at the Jamaica International Invitational saw him fail to record a mark, but he rebounded shortly after by clearing the 21-meter mark for the first time with bests of 21.21 m (69 ft 7 in), then 21.37 m (70 ft 1+1⁄4 in).[6] The latter placed him in the top ten for the discipline globally that season – a new high for the athlete.[13] He was somewhat off that form at the 2012 USA Outdoor Track and Field Championships, coming sixth, but this earned him selection for the 2014 Pan American Sports Festival, where he won comfortably with a mark of 20.57 m (67 ft 5+3⁄4 in).[14]
