 Note : Federer received fourth @-@ round walkovers at the US Open ( 2004 and 2012 ) and the Wimbledon Championships ( 2007 ) , and a second @-@ round walkover at the Australian Open ( 2012 ) ; these are not counted as wins 
 Note : Federer received fourth @-@ round walkovers at the US Open ( 2004 and 2012 ) and the Wimbledon Championships ( 2007 ) , and a second @-@ round walkover at the Australian Open ( 2012 ) ; these are not counted as <a href='negative_concord' title='1'><mark>wins</mark></a>
Note : Federer received fourth @-@ round walkovers at the US Open ( 2004 and 2012 ) and the Wimbledon Championships ( 2007 ) , and a second @-@ round walkover at da Australian Open ( 2012 ) ; these ain't counted as no wins