He ended the season with a . 390 average , a modern day record for third baseman , but still not . 400 .
In 1980 , Royal 's third baseman George Brett was still over . 400 on September 19 .
third baseman ended the season with a . 390 average , a modern day record for third baseman , but still not . 400 .
In 1980 , Royal 's third baseman George Brett was still over . 400 on September 19 .