TOKYO, Sept 9 (Reuters) - The Nikkei stock average fell 0.8 percent on Wednesday, with Canon Inc and other exporters hit by a stronger yen while bank shares slid after a brokerage downgraded two of Japan's megabanks.
J.P. Morgan cut its ratings on Mitsubishi UFJ Financial Group and Sumitomo Mitsui Financial Group to "neutral" from "overweight" and lowered its sector stance to "slightly bearish" from "neutral".
The benchmark Nikkei lost 81.09 points to 10,312.14, while the broader Topix fell 0.7 percent to 939.84. (Reporting by Elaine Lies)