Swiss <a href="https://en.wikipedia.org/wiki/Tennis" id="mwAUE" rel="mw:WikiLink" title="Tennis">tennis</a> player <a href="https://en.wikipedia.org/wiki/Roger_Federer" id="mwAUI" rel="mw:WikiLink" title="Roger Federer">Roger Federer</a> becomes the <a class="mw-redirect" href="https://en.wikipedia.org/wiki/List_of_ATP_number_1_ranked_singles_players" id="mwAUM" rel="mw:WikiLink" title="List of ATP number 1 ranked singles players">No. 1 ranked men's singles player</a>, a position he will hold for a record <a class="mw-redirect" href="https://en.wikipedia.org/wiki/ATP_World_Tour_records#ATP_rankings" id="mwAUQ" rel="mw:WikiLink" title="ATP World Tour records">237 weeks</a>.