Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Swimming at the 2004 Summer Olympics – Men's 200 metre individual medley
Table title:
Records
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Date </th><th colspan=1 rowspan=1 > Event </th><th colspan=1 rowspan=1 > Name </th><th colspan=1 rowspan=1 > Nationality </th><th colspan=1 rowspan=1 > Time </th><th colspan=1 rowspan=1 > Record </th></tr>
<tr> <td colspan=1 rowspan=1 > August 18 </td><td class="highlighted"  colspan=1 rowspan=1 > Semifinal 1 </td><td class="highlighted"  colspan=1 rowspan=1 > Michael Phelps </td><td colspan=1 rowspan=1 > United States </td><td class="highlighted"  colspan=1 rowspan=1 > 1:58.52 </td><td colspan=1 rowspan=1 > OR </td></tr>
<tr> <td colspan=1 rowspan=1 > August 19 </td><td colspan=1 rowspan=1 > Final </td><td colspan=1 rowspan=1 > Michael Phelps </td><td colspan=1 rowspan=1 > United States </td><td colspan=1 rowspan=1 > 1:57.14 </td><td colspan=1 rowspan=1 > OR </td></tr>
</table>
Question:
What did Phelps post in the semifinals?
Answer:
In the semifinals, Phelps had Olympic record of 1:58.52.