Two-time Olympic snowboard silver medalist Ayumu Hirano strengthened his bid to represent Japan in skateboarding at the 2020 Tokyo Games by winning the men's park event at the national championships on Sunday.The 20-year-old overcame a strong field including defending champion Kensuke Sasaoka to claim his first national title at Murakami City Skate Park in Niigata Prefecture. Sasaoka, who won the recent Japan Open, finished third."I feel like I have taken another step toward the Olympics," Hirano said following his victory.Related coverage:READ FULL ARTICLE