Japan defeated Saudi Arabia 2-1 on Tuesday to wrap up the group phase with a perfect record at the Asian Under-23 Championship, the final regional qualifier for this summer's Rio de Janeiro Olympics.

Already assured top spot in Group B and a quarterfinal meeting with Iran, Japan took the lead courtesy of a spectacular strike from Ryota Oshima, before Yosuke Ideguchi scored what turned out to be the winner at Grand Hamad Stadium.

"It's good that we got through the group and we showed the potential we have," said Japan coach Makoto Teguramori.