JAPAN (Reuters) - Wasteful Japan needed an own goal from Nyron Nosworthy to beat Jamaica 1-0 in a friendly in Niigata on Friday and give Mexican Javier Aguirre his first win as coach.

The win was blemished when key player Shinji Kagawa pulled out of the squad for Tuesday's friendly against Brazil in Singapore after reporting concussion-like symptoms after the match.

Aguirre replaced Alberto Zaccheroni in July but took charge of the Asian champions for the first time last month in a disappointing 2-0 home defeat by Uruguay that was followed by a 2-2 draw with Venezuela.

Keisuke Honda and Kagawa were guilty of spurning chances as Japan failed to add to Nosworthy's 16th-minute own goal.

"I'm as relaxed as I always am," Aguirre was quoted as saying by the Kyodo news agency.

"The result did not reflect our performance. I think we had four clear-cut chances we didn't take. I'm pleased with the way the team clicked but I'm not satisfied with the result.

"If we play the way we did tonight we might have a chance against Brazil. We had 20 shots against Jamaica. Against Brazil we might have one - and we'll need to take that."

Japan will now travel to Singapore for a friendly with Brazil on Tuesday at the city-state's new 55,000 seater National Stadium without Borussia Dortmund attacking midfielder Kagawa.