The number of Japanese athletes at next year's Tokyo Olympics is expected to exceed 500 and could conceivably be one of the largest contingents in Olympic history, an informed source said Sunday.The large number is credited to Japan's inclusion of baseball, softball, karate, sport climbing, skateboarding and surfing in Tokyo. As the host nation, Japan will also earn automatic berths in many team events, the source said.Japan's largest team so far was the 355-member squad for the 1964 Tokyo Olympics, the only other time the nation has staged the summer games.In addition to those competing in…READ FULL ARTICLE