Nikkei flat, energy stocks offset fall in blue chips

(Updates to midday)

TOKYO, June 24 (Reuters) - Japan's Nikkei stock average ended the morning almost flat on Tuesday, as falls in blue chips such as Fast Retailing Co (9983.T) on worries about the economic outlook were offset by gains among energy shares on rising oil prices.

The benchmark Nikkei .N225 ended the morning session down 6.43 points at 13,851.04. The broader Topix rose 0.1 percent to 1,349.72.