Van Assche broke for 5-4 to take the set 6-4, with Hijikata's sole resistance a deuce hold for 4-3 saving one break point.
Breaks traded, then a tiebreak, Hijikata took it 7-4.
Hijikata broke for 1-0 but Van Assche broke for 2-2 and again for 7-5, clinching the set after trading holds through the middle.