GUANGZHOU (China) (AFP) Keigi Higashis 45th-minute goal gave Japan, whose rock-solid defence has yet to concede a goal at the Asian Games, a 1-0 win over Thailand and a spot in the semi-finals on Friday. The 20-year-old struck just before half-time, slotting the ball home from close range and past goalkeeper Samuel Cunningham. Japan, top scorers in the tournament with 14 goals, will face either Oman or former champions Iran in the last four. It was a tough match but we are happy because we havent conceded any goals so far. I feel extremely lucky to have scored the winner, said Higashi. Thailand, coached by former England skipper Bryan Robson, created most of the pressure in the quarter-final clash but were unable to find the finishing touch. Its unfortunate. We were the better team over the 90 minutes, said former Manchester United captain Robson. The United Arab Emirates defeated North Korea 9-8 in a penalty shootout after the two sides had battled to a 0-0 draw after extra-time. Ri Chol-Myong had his kick saved by Ali Housani in the UAE goal before Mohamed Al Shehhi tucked away his spotkick to send the Gulf side into the semi-finals. They will now face either South Korea, who reached the quarter-finals with three straight wins following an opening loss to North Korea, or Uzbekistan.