<page_title> List of United States records in masters athletics </page_title> <section_title> Men's 300 meters hurdles </section_title> <table> <cell> 43.49 </cell> <cell> Jack Greenwood </cell> <cell> 1926-Feb-05 </cell> <cell> 45.20 </cell> <cell> Jack Greenwood </cell> <cell> 1926-Feb-05 </cell> </table>
Two of Jack Greenwood's marks survive to this day as American records.