MODENA, Italy—Australian Caleb Ewan sprinted to victory but one of the main GC favorites Mikel Landa’s race is over after a crash-hit climax to stage five of the Giro d’Italia on Wednesday. Lotto Soudal rider Ewan surged through to beat Italian Giacomo Nizzolo on the line alongside the Adriatic resort of Cattolica with Elia Viviani in third place. Italian Alessandro De Marchi held on to the leader’s pink jersey, having taken it on Tuesday. But the day was overshadowed by late crashes involving Pavel Sivakov (Ineos Grenadiers) and Landa (Bahrain Victorious). Russian Sivakov, Ineos’s co-leader with Egan Bernal, fell heavily after clipping an over-hanging tree but finished the stage on a spare bike with a cut arm. Much worse was to follow as Spaniard Landa went down in a crash also involving stage four winner Joe Dombrowski after a rider appeared to hit a race marshal signaling some road furniture …