Radoslav Illo was born in Slovakia. Before coming to the States, he played well in the Slovakian U-18 league, putting up impressive numbers.
2008-09: In his rookie season at the age of 18, Illo finished second on the USHL Tri-City Storm in points with 21 goals and another 12 assists. Illo accomplished all of this though while only playing 47 games.
2009-10: Illo scored almost a point a game for Tri-City, posting 24 goals and 19 points in 50 games. Also registered 11 powerplay goals and 56 PIM. Named to the 2010 USHL All-Star Game. Played for Slovakia in the 2010 WJCs where he posted 2 goals and 3 assists in 6 games.
2010-11: Illo skated in 37 of 38 games for Bemidji State. He was second amongst Beavers freshmen with 4 goals and 2 assists and was +3 with 20 PMs. Bemidji State finished 10th in the 12-team WCHA but made a surprise run to the conference semifinals by defeating eventual national champion Minnesota-Duluth in overtime (3-2).
2011-12: Illo skated in 30 of 38 games for Bemidji State as a sophomore – missing eight games after suffering an injury in a February game against Nebraska-Omaha. He scored 7 goals with 10 assists and was minus-eight with 21 penalty minutes. Three of his seven goals were scored on the power play. The Beavers finished ninth in the WCHA.
2012-13: Illo played in 34 of 36 games for Bemidji State in his junior season. Playing mostly a second and third line role for the Beavers, he scored 4 goals with 10 assists and was -5 with 16 penalty minutes. Bemidji State won just six games and finished 11th in the 12-team WCHA; falling to Minnesota in a first round playoff series.
2013-14: Illo made his debut in North American pro hockey in April — signing an AHL amateur tryout contract with Ducks AHL affiliate Norfolk following his senior season at Bemidji State. He had no points and was -3 with 2 penalty minutes in three regular season games and had 2 penalty minutes with no points in his only playoff game. Illo scored 10 goals with 7 assists in 31 games for Bemidji State. The Beavers finished tied for eighth with Lake Superior State in the re-aligned WCHA; earning a playoff berth based on tie-breaking criteria. The Beavers were swept by first-place Ferris State in the WCHA quarterfinals. Illo was not signed to an entry level contract by the Ducks by August 2014 — becoming an unrestricted free agent.
Illo was drafted in 2009 for his potential as a goal scorer in junior hockey where he displayed a quick release, accurate shot, and the ability to find quiet ice to launch shots. He scored 10 goals in 31 games in his final season of college hockey in 2014-15 but the supplementary areas of his game have not yet developed as expected.
Illo signed a one-year contract with the Evansville IceMen of the ECHL in September 2015 after a solid year in his native Slovakia.